7a-8=15a+8

Answer 1

7a-8 =15a + 8
add 8 to both sides
7a = 15a + 16
subtract 15a from both sides
-8a = 16
divide by -8
a= -2

Answer 2

7a-8=15a+8

7a - 15a = 16
-8a = 16
a = -2