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100+25s=220+15s
We move all terms to the left:
100+25s-(220+15s)=0
We add all the numbers together, and all the variables
25s-(15s+220)+100=0
We get rid of parentheses
25s-15s-220+100=0
We add all the numbers together, and all the variables
10s-120=0
We move all terms containing s to the left, all other terms to the right
10s=120
s=120/10
s=12
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