If (3x+40°) and (x-20°) are supplementary angle .find x
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(3x +40)+(x-20)=180
3x+40+ x-20=180
4x+20=180
4x=180-20
x=160/4=40
3x+40+ x-20=180
4x+20=180
4x=180-20
x=160/4=40
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