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10x+13=3(3x+4)
We move all terms to the left:
10x+13-(3(3x+4))=0
We calculate terms in parentheses: -(3(3x+4)), so:We get rid of parentheses
3(3x+4)
We multiply parentheses
9x+12
Back to the equation:
-(9x+12)
10x-9x-12+13=0
We add all the numbers together, and all the variables
x+1=0
We move all terms containing x to the left, all other terms to the right
x=-1
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