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100=5(x+4)
We move all terms to the left:
100-(5(x+4))=0
We calculate terms in parentheses: -(5(x+4)), so:We get rid of parentheses
5(x+4)
We multiply parentheses
5x+20
Back to the equation:
-(5x+20)
-5x-20+100=0
We add all the numbers together, and all the variables
-5x+80=0
We move all terms containing x to the left, all other terms to the right
-5x=-80
x=-80/-5
x=+16
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