Question

1) 2 x + 6 = x + 18

Answer 1

1) 2x + 6 = x + 18
    2x - x = 18 - 6
    x = 12

Answer 2

$2 x + 6 = x + 18 \\ \\ 2 x - x = 18 - 6 \\ \\ \boxed{\boxed{x = 12}}$