An angle is twice its supplement. find the measure of the angles

120°

Step-by-step explanation:

Let the angle be x then twice it's supplement is 2(180 - x)

Equating the two gives

2(180 - x) = x ← distribute the parenthesis on the left side

360 - 2x = x ( subtract x from both sides )

360 - 3x = 0 ( subtract 360 from both sides )

- 3x = - 360 ( divide both sides by - 3 )

x = 120

The angle is x = 120°

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0