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125-x=(3x+13)
We move all terms to the left:
125-x-((3x+13))=0
We add all the numbers together, and all the variables
-1x-((3x+13))+125=0
We calculate terms in parentheses: -((3x+13)), so:We get rid of parentheses
(3x+13)
We get rid of parentheses
3x+13
Back to the equation:
-(3x+13)
-1x-3x-13+125=0
We add all the numbers together, and all the variables
-4x+112=0
We move all terms containing x to the left, all other terms to the right
-4x=-112
x=-112/-4
x=+28
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