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21=6s+8ss+1.50
We move all terms to the left:
21-(6s+8ss+1.50)=0
We add all the numbers together, and all the variables
-(6s+8ss+1.5)+21=0
We get rid of parentheses
-6s-8ss-1.5+21=0
We add all the numbers together, and all the variables
-6s-8ss+19.5=0
We move all terms containing s to the left, all other terms to the right
-6s-8ss=-19.5
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