Question

$2x$
$2$
$-20$
$2x
eq 40$
$10 - 4x = 18$
$10 - 3x
eq 55$

Explanation:

Step1: Isolate the term with $x$

Subtract 10 from both sides:
$10 - 4x - 10 = 18 - 10$
$-4x = 8$

Step2: Solve for $x$

Divide both sides by -4:
$\frac{-4x}{-4} = \frac{8}{-4}$

Answer:

$x = -2$