Question

4 (a - 2) -2 (a+ 1) =4???

Answer 1

4a-8-2a+2=4
4a-2a=4+8
2a=12
a=
$\frac{12}{2}$
a=6

Answer 2

$4(a - 2) - 2(a + 1) = 4 \\ 4a - 8 - 2a - 2 = 4 \\ 2a - 10 = 4 \\ 2a = 4 + 10 \\ 2a = 14 \\ a = 7$