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6s+3s+9=0
We simplify the equation to the form, which is simple to understand
6s+3s+9=0
We move all terms containing s to the left and all other terms to the right.
+6s+3s=0-9
We simplify left and right side of the equation.
+9s=-9
We divide both sides of the equation by 9 to get s.
s=-1
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