(3X+60) + 60 = 180 ( CONSECUTIVE ANGLES are supplementary)
Now, solve for x
3x + 60 + 60 = 180
3x + 120 = 180
subtract 120 from both-side of the equation
3x = 180 - 120
3x = 60
divide both-side of the equation by 3
x = 20
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