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12s-20=50-3s-25
We move all terms to the left:
12s-20-(50-3s-25)=0
We add all the numbers together, and all the variables
12s-(-3s+25)-20=0
We get rid of parentheses
12s+3s-25-20=0
We add all the numbers together, and all the variables
15s-45=0
We move all terms containing s to the left, all other terms to the right
15s=45
s=45/15
s=3
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