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-4s+4(-7-2s)=-5s-2s
We move all terms to the left:
-4s+4(-7-2s)-(-5s-2s)=0
We add all the numbers together, and all the variables
-4s+4(-2s-7)-(-7s)=0
We multiply parentheses
-4s-8s-(-7s)-28=0
We get rid of parentheses
-4s-8s+7s-28=0
We add all the numbers together, and all the variables
-5s-28=0
We move all terms containing s to the left, all other terms to the right
-5s=28
s=28/-5
s=-5+3/5
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