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-25=-5x-5(-3x+21)
We move all terms to the left:
-25-(-5x-5(-3x+21))=0
We calculate terms in parentheses: -(-5x-5(-3x+21)), so:We get rid of parentheses
-5x-5(-3x+21)
We multiply parentheses
-5x+15x-105
We add all the numbers together, and all the variables
10x-105
Back to the equation:
-(10x-105)
-10x+105-25=0
We add all the numbers together, and all the variables
-10x+80=0
We move all terms containing x to the left, all other terms to the right
-10x=-80
x=-80/-10
x=+8
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