Novgorod Oblast, Russia, is area code +7 816. (The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in fu…ll international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, and many other countries use different prefixes.) (MORE)

20c + 5 = 5c + 65 Divide through by 5: 4c + 1 = c + 13 Subtract c from both sides: 3c + 1 = 13 Subtract 1 from both sides: 3c = 12 Divide both sides by 3: c = 4 20c + 5 = 5c …+65 20c - 5c= 65 - 5. 15c = 60. 15c/15 = 60/15. c = 4 (alternative method). (MORE)