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9+10s-4=7s+21-5s
We move all terms to the left:
9+10s-4-(7s+21-5s)=0
We add all the numbers together, and all the variables
10s-(2s+21)+9-4=0
We add all the numbers together, and all the variables
10s-(2s+21)+5=0
We get rid of parentheses
10s-2s-21+5=0
We add all the numbers together, and all the variables
8s-16=0
We move all terms containing s to the left, all other terms to the right
8s=16
s=16/8
s=2
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