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39(1+x)=15(3+x)
We move all terms to the left:
39(1+x)-(15(3+x))=0
We add all the numbers together, and all the variables
39(x+1)-(15(x+3))=0
We multiply parentheses
39x-(15(x+3))+39=0
We calculate terms in parentheses: -(15(x+3)), so:We get rid of parentheses
15(x+3)
We multiply parentheses
15x+45
Back to the equation:
-(15x+45)
39x-15x-45+39=0
We add all the numbers together, and all the variables
24x-6=0
We move all terms containing x to the left, all other terms to the right
24x=6
x=6/24
x=1/4
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