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4s-12=-5s=51
We move all terms to the left:
4s-12-(-5s)=0
We get rid of parentheses
4s+5s-12=0
We add all the numbers together, and all the variables
9s-12=0
We move all terms containing s to the left, all other terms to the right
9s=12
s=12/9
s=1+1/3
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