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x/3-20=13
We move all terms to the left:
x/3-20-(13)=0
We add all the numbers together, and all the variables
x/3-33=0
We multiply all the terms by the denominator
x-33*3=0
We add all the numbers together, and all the variables
x-99=0
We move all terms containing x to the left, all other terms to the right
x=99
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