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s=(49+21)/(7+7)
We move all terms to the left:
s-((49+21)/(7+7))=0
We add all the numbers together, and all the variables
s-(70/14)=0
We get rid of parentheses
s-70/14=0
We multiply all the terms by the denominator
s*14-70=0
Wy multiply elements
14s-70=0
We move all terms containing s to the left, all other terms to the right
14s=70
s=70/14
s=5
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