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s/5+-9=-18
We move all terms to the left:
s/5+-9-(-18)=0
We add all the numbers together, and all the variables
s/5+9=0
We multiply all the terms by the denominator
s+9*5=0
We add all the numbers together, and all the variables
s+45=0
We move all terms containing s to the left, all other terms to the right
s=-45
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