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145=2s+3
We move all terms to the left:
145-(2s+3)=0
We get rid of parentheses
-2s-3+145=0
We add all the numbers together, and all the variables
-2s+142=0
We move all terms containing s to the left, all other terms to the right
-2s=-142
s=-142/-2
s=+71
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