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50=42+3s
We move all terms to the left:
50-(42+3s)=0
We add all the numbers together, and all the variables
-(3s+42)+50=0
We get rid of parentheses
-3s-42+50=0
We add all the numbers together, and all the variables
-3s+8=0
We move all terms containing s to the left, all other terms to the right
-3s=-8
s=-8/-3
s=2+2/3
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