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6s+3s=139.50
We simplify the equation to the form, which is simple to understand
6s+3s=139.50
We move all terms containing s to the left and all other terms to the right.
+6s+3s=+139.5
We simplify left and right side of the equation.
+9s=+139.5
We divide both sides of the equation by 9 to get s.
s=15.5
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