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140
angle 3 and 4 must be equal
2x-80=x+30 x=110
angle 3=x+30=140
x + 30 = 2x - 80 x + 30 -( 2x - 80 ) = 0 x + 30 - 2x + 80 = 0 - x + 110 = 0 - x = - 110 x = 110
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