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x/3+63=90
We move all terms to the left:
x/3+63-(90)=0
We add all the numbers together, and all the variables
x/3-27=0
We multiply all the terms by the denominator
x-27*3=0
We add all the numbers together, and all the variables
x-81=0
We move all terms containing x to the left, all other terms to the right
x=81
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