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s+3 1/2+20=74
We simplify the equation to the form, which is simple to understand
s+31/2+20=74
We move all terms containing s to the left and all other terms to the right.
+1s=+74-15.5-20
We simplify left and right side of the equation.
+1s=+38.5
We divide both sides of the equation by 1 to get s.
s=38.5
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