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x/3-9=-30
We move all terms to the left:
x/3-9-(-30)=0
We add all the numbers together, and all the variables
x/3+21=0
We multiply all the terms by the denominator
x+21*3=0
We add all the numbers together, and all the variables
x+63=0
We move all terms containing x to the left, all other terms to the right
x=-63
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