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15s/15=90/15
We move all terms to the left:
15s/15-(90/15)=0
We add all the numbers together, and all the variables
15s/15-6=0
We multiply all the terms by the denominator
15s-6*15=0
We add all the numbers together, and all the variables
15s-90=0
We move all terms containing s to the left, all other terms to the right
15s=90
s=90/15
s=6
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