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x/9+7=21
We move all terms to the left:
x/9+7-(21)=0
We add all the numbers together, and all the variables
x/9-14=0
We multiply all the terms by the denominator
x-14*9=0
We add all the numbers together, and all the variables
x-126=0
We move all terms containing x to the left, all other terms to the right
x=126
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