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That would be (10 + 30) = 40 degrees west longitude.
The degree of longitude equivalent to east of 5 degrees west longitude is 355 degrees. This is because there are 360 degrees in a full circle, so moving 5 degrees east from 5 degrees west would place you at 355 degrees longitude.
The prime Meridian is 0 degrees longitude.
Longitude ranges from 0 to 360 degrees with 0 located at the Prime Meridian in Greenwich, England. A longitude of 590 degrees would be a theoretical point beyond 360 degrees and would wrap around to approximately 230 degrees.
90 degrees 40 degrees and 90 degrees
That would be zero degrees longitude.
A longitude of 210 degrees means that you are measuring longitude from 0 to 360 degrees, which is fine, but very often people use -180 to +180 degrees, also called 180 degrees west to 180 degrees east instead. 210 degrees longitude is the same as 150 degrees west. You would pass French Polynesia and you would then make a landfall in Alaska in the USA which is in North America.
If you start in Sacramento, California you are at approximately 121 degrees west longitude. Heading east twice around the Earth would be equivalent to 360 degrees x 2, which is 720 degrees. You would have traveled 720 degrees of longitude.
26 degrees latitude and 430 degrees longitude do not exist on Earth's surface as the latitude ranges from -90 to 90 degrees and the longitude ranges from -180 to 180 degrees. If you meant 26 degrees S latitude and 130 degrees E longitude from Australia, it would be in the Indian Ocean southwest of Australia.
You would be at 60 degrees west longitude. The prime meridian is located at 0 degrees longitude, so traveling 690 miles to the east would put you at 60 degrees west longitude. Turning around and traveling 207 miles to the west brings you back to 0 degrees.
To convert decimal degrees east to decimal degrees west, you can subtract the east longitude from 360. For example, if the longitude is 80 degrees east, to convert it to degrees west, you would do: 360 - 80 = 280 degrees west.
At 80°S and almost ANY longitude, you would be standing on Antarctic ice.