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2s+42=7s+75
We move all terms to the left:
2s+42-(7s+75)=0
We get rid of parentheses
2s-7s-75+42=0
We add all the numbers together, and all the variables
-5s-33=0
We move all terms containing s to the left, all other terms to the right
-5s=33
s=33/-5
s=-6+3/5
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