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39+x=3(11+x)
We move all terms to the left:
39+x-(3(11+x))=0
We add all the numbers together, and all the variables
x-(3(x+11))+39=0
We calculate terms in parentheses: -(3(x+11)), so:We get rid of parentheses
3(x+11)
We multiply parentheses
3x+33
Back to the equation:
-(3x+33)
x-3x-33+39=0
We add all the numbers together, and all the variables
-2x+6=0
We move all terms containing x to the left, all other terms to the right
-2x=-6
x=-6/-2
x=+3
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