Question

solve for x.
x = □

Explanation:

Step1: Identify angle - relationship

The angles $(9x + 30)^{\circ}$ and $(12x)^{\circ}$ are corresponding angles. For parallel lines, corresponding angles are equal. So we set up the equation $9x+30 = 12x$.

Step2: Solve the equation

Subtract $9x$ from both sides: $30=12x - 9x$.
Simplify the right - hand side: $30 = 3x$.
Divide both sides by 3: $x=\frac{30}{3}$.

Answer:

$10$