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-109=-3x+7(4x+13)
We move all terms to the left:
-109-(-3x+7(4x+13))=0
We calculate terms in parentheses: -(-3x+7(4x+13)), so:We get rid of parentheses
-3x+7(4x+13)
We multiply parentheses
-3x+28x+91
We add all the numbers together, and all the variables
25x+91
Back to the equation:
-(25x+91)
-25x-91-109=0
We add all the numbers together, and all the variables
-25x-200=0
We move all terms containing x to the left, all other terms to the right
-25x=200
x=200/-25
x=-8
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