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12+25s=s-34
We move all terms to the left:
12+25s-(s-34)=0
We get rid of parentheses
25s-s+34+12=0
We add all the numbers together, and all the variables
24s+46=0
We move all terms containing s to the left, all other terms to the right
24s=-46
s=-46/24
s=-1+11/12
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