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15=13+x/3
We move all terms to the left:
15-(13+x/3)=0
We add all the numbers together, and all the variables
-(x/3+13)+15=0
We get rid of parentheses
-x/3-13+15=0
We multiply all the terms by the denominator
-x-13*3+15*3=0
We add all the numbers together, and all the variables
-1x+6=0
We move all terms containing x to the left, all other terms to the right
-x=-6
x=-6/-1
x=+6
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