Question

2 (ax – 1) = x (b + a)

Answer 1

2.(ax - 1) = x.(b + a)

Multiplicando

2ax - 2 = bx + ax

Isolando

2ax - ax - bx = 2

ax - bx = 2

Fatorando

x.(a - b) = 2

$x=\frac{2}{a-b}$