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-84=4(5x+4)
We move all terms to the left:
-84-(4(5x+4))=0
We calculate terms in parentheses: -(4(5x+4)), so:We get rid of parentheses
4(5x+4)
We multiply parentheses
20x+16
Back to the equation:
-(20x+16)
-20x-16-84=0
We add all the numbers together, and all the variables
-20x-100=0
We move all terms containing x to the left, all other terms to the right
-20x=100
x=100/-20
x=-5
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