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200=5s-100+2s
We simplify the equation to the form, which is simple to understand
200=5s-100+2s
We move all terms containing s to the left and all other terms to the right.
-5s-2s=-100-200
We simplify left and right side of the equation.
-7s=-300
We divide both sides of the equation by -7 to get s.
s=42.8571428571
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