3a+8=15-(9a-9)

Answer 1

3a+8=15-(9a-9)
3a+8=15-1(9a-9)
3a+8=15-9a+9
+3a +3a
12a+8=15
-8 -8
12a=7
/12 /12
a=.5833 repeating

Answer 2

3a+8=15-(9a-9)
3a+8=15-9a+9
3a+8=24-9a
12a+8=24
12a=16
a=16/12
a=1 1/3