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s/2.1=10.5
We move all terms to the left:
s/2.1-(10.5)=0
We add all the numbers together, and all the variables
s/2.1-10.5=0
We multiply all the terms by the denominator
s-(10.5)*2.1=0
We add all the numbers together, and all the variables
s-22.05=0
We move all terms containing s to the left, all other terms to the right
s=22.05
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