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70x+40(80)=75(70+x)
We move all terms to the left:
70x+40(80)-(75(70+x))=0
We add all the numbers together, and all the variables
70x-(75(x+70))+4080=0
We calculate terms in parentheses: -(75(x+70)), so:We get rid of parentheses
75(x+70)
We multiply parentheses
75x+5250
Back to the equation:
-(75x+5250)
70x-75x-5250+4080=0
We add all the numbers together, and all the variables
-5x-1170=0
We move all terms containing x to the left, all other terms to the right
-5x=1170
x=1170/-5
x=-234
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