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-2s+9-6s=31
We simplify the equation to the form, which is simple to understand
-2s+9-6s=31
We move all terms containing s to the left and all other terms to the right.
-2s-6s=+31-9
We simplify left and right side of the equation.
-8s=+22
We divide both sides of the equation by -8 to get s.
s=-2.75
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