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4s-12=-5s+15
We simplify the equation to the form, which is simple to understand
4s-12=-5s+15
We move all terms containing s to the left and all other terms to the right.
+4s+5s=+15+12
We simplify left and right side of the equation.
+9s=+27
We divide both sides of the equation by 9 to get s.
s=3
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