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7+q/5=91
We move all terms to the left:
7+q/5-(91)=0
We add all the numbers together, and all the variables
q/5-84=0
We multiply all the terms by the denominator
q-84*5=0
We add all the numbers together, and all the variables
q-420=0
We move all terms containing q to the left, all other terms to the right
q=420
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