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13=3+x/5
We move all terms to the left:
13-(3+x/5)=0
We add all the numbers together, and all the variables
-(x/5+3)+13=0
We get rid of parentheses
-x/5-3+13=0
We multiply all the terms by the denominator
-x-3*5+13*5=0
We add all the numbers together, and all the variables
-1x+50=0
We move all terms containing x to the left, all other terms to the right
-x=-50
x=-50/-1
x=+50
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