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-(x+7)=-2(3x-4)
We move all terms to the left:
-(x+7)-(-2(3x-4))=0
We get rid of parentheses
-x-(-2(3x-4))-7=0
We calculate terms in parentheses: -(-2(3x-4)), so:We add all the numbers together, and all the variables
-2(3x-4)
We multiply parentheses
-6x+8
Back to the equation:
-(-6x+8)
-1x-(-6x+8)-7=0
We get rid of parentheses
-1x+6x-8-7=0
We add all the numbers together, and all the variables
5x-15=0
We move all terms containing x to the left, all other terms to the right
5x=15
x=15/5
x=3
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