Question

a. $24 + 2x = 3x + 2(3 \cdot 4)$

Explanation:

Step1: Simplify right-hand side

First calculate $3\cdot4=12$, then $2\times12=24$. The equation becomes:
$24 + 2x = 3x + 24$

Step2: Subtract 24 from both sides

Eliminate the constant term on both sides:
$24 + 2x - 24 = 3x + 24 - 24$
$2x = 3x$

Step3: Subtract $2x$ from both sides

Isolate the variable $x$:
$2x - 2x = 3x - 2x$
$0 = x$

Answer:

$x=0$