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5s+2s-13=7s-13
We move all terms to the left:
5s+2s-13-(7s-13)=0
We add all the numbers together, and all the variables
7s-(7s-13)-13=0
We get rid of parentheses
7s-7s+13-13=0
We add all the numbers together, and all the variables
=0
s=0/1
s=0
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