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13=x/5+8
We move all terms to the left:
13-(x/5+8)=0
We get rid of parentheses
-x/5-8+13=0
We multiply all the terms by the denominator
-x-8*5+13*5=0
We add all the numbers together, and all the variables
-1x+25=0
We move all terms containing x to the left, all other terms to the right
-x=-25
x=-25/-1
x=+25
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