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6s-78=s+42
We move all terms to the left:
6s-78-(s+42)=0
We get rid of parentheses
6s-s-42-78=0
We add all the numbers together, and all the variables
5s-120=0
We move all terms containing s to the left, all other terms to the right
5s=120
s=120/5
s=24
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