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115=-5(5-4x)
We move all terms to the left:
115-(-5(5-4x))=0
We add all the numbers together, and all the variables
-(-5(-4x+5))+115=0
We calculate terms in parentheses: -(-5(-4x+5)), so:We get rid of parentheses
-5(-4x+5)
We multiply parentheses
20x-25
Back to the equation:
-(20x-25)
-20x+25+115=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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