Question

$-x + 6 = 4x + 21$

Explanation:

Step1: Move x - terms to one side

Add \(x\) to both sides:
\(-x + x+6=4x + x+21\)
\(6 = 5x+21\)

Step2: Move constant - terms to the other side

Subtract 21 from both sides:
\(6 - 21=5x+21 - 21\)
\(-15 = 5x\)

Step3: Solve for x

Divide both sides by 5:
\(\frac{-15}{5}=\frac{5x}{5}\)
\(x=-3\)

Answer:

\(x = - 3\)