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-2x-13=-(x-4)
We move all terms to the left:
-2x-13-(-(x-4))=0
We calculate terms in parentheses: -(-(x-4)), so:We get rid of parentheses
-(x-4)
We get rid of parentheses
-x+4
We add all the numbers together, and all the variables
-1x+4
Back to the equation:
-(-1x+4)
-2x+1x-4-13=0
We add all the numbers together, and all the variables
-1x-17=0
We move all terms containing x to the left, all other terms to the right
-x=17
x=17/-1
x=-17
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