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13=(4x-12)+(x+5)
We move all terms to the left:
13-((4x-12)+(x+5))=0
We calculate terms in parentheses: -((4x-12)+(x+5)), so:We get rid of parentheses
(4x-12)+(x+5)
We get rid of parentheses
4x+x-12+5
We add all the numbers together, and all the variables
5x-7
Back to the equation:
-(5x-7)
-5x+7+13=0
We add all the numbers together, and all the variables
-5x+20=0
We move all terms containing x to the left, all other terms to the right
-5x=-20
x=-20/-5
x=+4
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