Question

solve for x.
5(x - 10) = 30 - 15x
\bigcirc\\ x = 1
\bigcirc\\ x = 4
\bigcirc\\ x = 5
\bigcirc\\ x = 8

Explanation:

Step1: Expand left-hand side

$5(x - 10) = 5x - 50$
Equation becomes: $5x - 50 = 30 - 15x$

Step2: Add 15x to both sides

$5x + 15x - 50 = 30 - 15x + 15x$
$20x - 50 = 30$

Step3: Add 50 to both sides

$20x - 50 + 50 = 30 + 50$
$20x = 80$

Step4: Divide by 20

$x = \frac{80}{20}$

Answer:

x=4