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s/7=-8
We move all terms to the left:
s/7-(-8)=0
We add all the numbers together, and all the variables
s/7+8=0
We multiply all the terms by the denominator
s+8*7=0
We add all the numbers together, and all the variables
s+56=0
We move all terms containing s to the left, all other terms to the right
s=-56
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