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s=3.14(15+5)
We move all terms to the left:
s-(3.14(15+5))=0
We add all the numbers together, and all the variables
s-(3.1420)=0
We add all the numbers together, and all the variables
s-3.142=0
We move all terms containing s to the left, all other terms to the right
s=3.142
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