Question

(blank)+(7x+24)=180
7x + (blank)+ = 180
7x =
x =

Answer 1

first blank: 72°

2nd blank: 96

next line: 84

last: 12

Explanation:

The two marked angles are called same-side interior angles or consecutive angles.

They add up to 180°

Thats how you know how to set up the equation.

72° + 7x + 24 = 180

Add the plain numbers (the 72 and 24)

7x + 96 = 180

subtract 96 from both sides.

7x = 84

Divide both sides by 7.

x = 12