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-28=3s+2
We move all terms to the left:
-28-(3s+2)=0
We get rid of parentheses
-3s-2-28=0
We add all the numbers together, and all the variables
-3s-30=0
We move all terms containing s to the left, all other terms to the right
-3s=30
s=30/-3
s=-10
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