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80=5(-5x-4)
We move all terms to the left:
80-(5(-5x-4))=0
We calculate terms in parentheses: -(5(-5x-4)), so:We get rid of parentheses
5(-5x-4)
We multiply parentheses
-25x-20
Back to the equation:
-(-25x-20)
25x+20+80=0
We add all the numbers together, and all the variables
25x+100=0
We move all terms containing x to the left, all other terms to the right
25x=-100
x=-100/25
x=-4
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