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13=8+x/3
We move all terms to the left:
13-(8+x/3)=0
We add all the numbers together, and all the variables
-(x/3+8)+13=0
We get rid of parentheses
-x/3-8+13=0
We multiply all the terms by the denominator
-x-8*3+13*3=0
We add all the numbers together, and all the variables
-1x+15=0
We move all terms containing x to the left, all other terms to the right
-x=-15
x=-15/-1
x=+15
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