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112=-4(5x+7)
We move all terms to the left:
112-(-4(5x+7))=0
We calculate terms in parentheses: -(-4(5x+7)), so:We get rid of parentheses
-4(5x+7)
We multiply parentheses
-20x-28
Back to the equation:
-(-20x-28)
20x+28+112=0
We add all the numbers together, and all the variables
20x+140=0
We move all terms containing x to the left, all other terms to the right
20x=-140
x=-140/20
x=-7
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