Answer
x = 23
Work Step by Step
tep 1: m$\angle$ 1 + m$\angle$ 2 = m$\angle$ ABC.
Step 2: Substitute x for m$\angle$ 1, (2x + 3) for m$\angle$ 2, and 72 for m$\angle$ ABC.
x + (2x + 3) = 72
Step 3: Simplify the left side of the equation.
3x + 3 = 72
Step 4: Subtract 3 from both sides of the equation.
3x + 3 - 3 = 72 - 3
Step 5: Simplify. 3x = 69
Step 6: Divide both sides by 3.
$\frac{3x}{3}$ = $\frac{69}{3}$
Step 7: Solve. x = 23
