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-25=2s-6s
We move all terms to the left:
-25-(2s-6s)=0
We add all the numbers together, and all the variables
-(-4s)-25=0
We get rid of parentheses
4s-25=0
We move all terms containing s to the left, all other terms to the right
4s=25
s=25/4
s=6+1/4
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