Question

9-3(a-1)=4+a

Answer 1

9 -3a + 3 = 4 + a

Answer 2

Add like terms.

Answer 3

-3a + 12 = 4 + a

-3a - a = 4 - 12

Answer 4

-4a = -8

Cancel the -ve signs both sides.

4a = 8

a = 2