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38s-39=51s-91
We simplify the equation to the form, which is simple to understand
38s-39=51s-91
We move all terms containing s to the left and all other terms to the right.
+38s-51s=-91+39
We simplify left and right side of the equation.
-13s=-52
We divide both sides of the equation by -13 to get s.
s=4
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