2 (a+1)-3(a-5)=7a

2 (a+1)-3(a-5)=7a 2a + 2 - 3a + 15 = 7a -a + 17 = 7a 17 = 8a a = 2⅛

2 (a+1)-3(a-5)=7a 2a + 2 - 3a + 15 = 7a -a + 17 = 7a / +a 17 = 8a / :8 a = 2 1/8

2 (a+1)-3(a-5)=7a 2a+2 - 3a-15=7a 2a-3a-7a=-2+15 -8a=13//:(-8) a=-1,625