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21.61-1.29s=10
We move all terms to the left:
21.61-1.29s-(10)=0
We add all the numbers together, and all the variables
-1.29s+11.61=0
We move all terms containing s to the left, all other terms to the right
-1.29s=-11.61
s=-11.61/-1.29
s=+9
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