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x-11=3(x+13)
We move all terms to the left:
x-11-(3(x+13))=0
We calculate terms in parentheses: -(3(x+13)), so:We get rid of parentheses
3(x+13)
We multiply parentheses
3x+39
Back to the equation:
-(3x+39)
x-3x-39-11=0
We add all the numbers together, and all the variables
-2x-50=0
We move all terms containing x to the left, all other terms to the right
-2x=50
x=50/-2
x=-25
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