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8x-13=3(4+x)
We move all terms to the left:
8x-13-(3(4+x))=0
We add all the numbers together, and all the variables
8x-(3(x+4))-13=0
We calculate terms in parentheses: -(3(x+4)), so:We get rid of parentheses
3(x+4)
We multiply parentheses
3x+12
Back to the equation:
-(3x+12)
8x-3x-12-13=0
We add all the numbers together, and all the variables
5x-25=0
We move all terms containing x to the left, all other terms to the right
5x=25
x=25/5
x=5
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