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7+s/9=25
We move all terms to the left:
7+s/9-(25)=0
We add all the numbers together, and all the variables
s/9-18=0
We multiply all the terms by the denominator
s-18*9=0
We add all the numbers together, and all the variables
s-162=0
We move all terms containing s to the left, all other terms to the right
s=162
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