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x/6-9=21
We move all terms to the left:
x/6-9-(21)=0
We add all the numbers together, and all the variables
x/6-30=0
We multiply all the terms by the denominator
x-30*6=0
We add all the numbers together, and all the variables
x-180=0
We move all terms containing x to the left, all other terms to the right
x=180
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