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-12=-7-2.5s
We simplify the equation to the form, which is simple to understand
-12=-7-2.5s
We move all terms containing s to the left and all other terms to the right.
+2.5s=-7+12
We simplify left and right side of the equation.
+2.5s=+5
We divide both sides of the equation by 02.5 to get s.
s=2
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