Question

solve for x.
(7x + 18)°
81°
x =

Explanation:

Step1: Identify angle - relationship

Assume that $\angle DHI$ and $\angle FIC$ are corresponding angles or vertical - angles (if the lines are parallel or by vertical - angle property). So, $7x + 18=81$.

Step2: Solve the equation for x

Subtract 18 from both sides of the equation: $7x=81 - 18$.
$7x = 63$.
Then divide both sides by 7: $x=\frac{63}{7}$.

Answer:

$9$