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21=x/3-13
We move all terms to the left:
21-(x/3-13)=0
We get rid of parentheses
-x/3+13+21=0
We multiply all the terms by the denominator
-x+13*3+21*3=0
We add all the numbers together, and all the variables
-1x+102=0
We move all terms containing x to the left, all other terms to the right
-x=-102
x=-102/-1
x=+102
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