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7=-2x+5(x+5)
We move all terms to the left:
7-(-2x+5(x+5))=0
We calculate terms in parentheses: -(-2x+5(x+5)), so:We get rid of parentheses
-2x+5(x+5)
We multiply parentheses
-2x+5x+25
We add all the numbers together, and all the variables
3x+25
Back to the equation:
-(3x+25)
-3x-25+7=0
We add all the numbers together, and all the variables
-3x-18=0
We move all terms containing x to the left, all other terms to the right
-3x=18
x=18/-3
x=-6
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