What is this and how do i solve

Step-by-step explanation:

The angles 7x° and (x + 20)° are supplementary angles.

Supplementary angles add up to 180°.

Therefore we have the equation:

7x + (x + 20) = 180

7x + x + 20 = 180            subtract 20 from both sides

8x = 160         divide both sides by 8

x = 20

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