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s+3.5s+20=47
We simplify the equation to the form, which is simple to understand
s+3.5s+20=47
We move all terms containing s to the left and all other terms to the right.
+1s+3.5s=+47-20
We simplify left and right side of the equation.
+4.5s=+27
We divide both sides of the equation by 4.5 to get s.
s=6
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