Question

1. $12 - x = 18$

Explanation:

Step1: Isolate the $-x$ term

Subtract 12 from both sides:
$12 - x - 12 = 18 - 12$
$-x = 6$

Step2: Solve for $x$

Multiply both sides by $-1$:
$(-1) \times (-x) = 6 \times (-1)$

Answer:

$x = -6$