7a + 4 = 5a + 7 7a = 5a + 3 2a = 3 a = 3/2
a + 18 = 7a a-a +18 = 7a-a 18 = 6a 18/6 = 6a/6 3 = a 3=a
-7a+2a+9 is also -5a+9. -5a+9=24. -5a=15. a=-3.
Collect like terms: 9a -7a = 9 - 15, ie 2a = -6, so a = -3
2a+5a=3 7a=3 a=3/7 or .4286
The variable is a. You can solve for it, like this: 8a - 9 = 7a - 6 8a = 7a + 3 8a - 7a = 3 a = 3
It's a simple linear equation in 'a'.If you want to know the value of 'a' that makes the equation true,you can find it as follows:7a + 3 = 21Subtract 3 from each side:7a = 18Divide each side by 7:a = 18/7
7A + 3
a + 6a - 9 = 30 7a - 9 = 30 7a = 30 + 9 7a = 39 a = 39/7 a = 5.571 (to 3 decimal places only).
7a-3
75
11a+9 = 4a+30 11a-4a = 30-9 7a = 21 Solution: a = 3