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.2s=4s-21
We simplify the equation to the form, which is simple to understand
.2s=4s-21
We move all terms containing s to the left and all other terms to the right.
+ 0.2s-4s=-21
We simplify left and right side of the equation.
-3.8s=-21
We divide both sides of the equation by -3.8 to get s.
s=5.52631578947
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