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71=10s+21
We move all terms to the left:
71-(10s+21)=0
We get rid of parentheses
-10s-21+71=0
We add all the numbers together, and all the variables
-10s+50=0
We move all terms containing s to the left, all other terms to the right
-10s=-50
s=-50/-10
s=+5
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