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80-2(x-40)=4(x-50)
We move all terms to the left:
80-2(x-40)-(4(x-50))=0
We multiply parentheses
-2x-(4(x-50))+80+80=0
We calculate terms in parentheses: -(4(x-50)), so:We add all the numbers together, and all the variables
4(x-50)
We multiply parentheses
4x-200
Back to the equation:
-(4x-200)
-2x-(4x-200)+160=0
We get rid of parentheses
-2x-4x+200+160=0
We add all the numbers together, and all the variables
-6x+360=0
We move all terms containing x to the left, all other terms to the right
-6x=-360
x=-360/-6
x=+60
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