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3m-8m+3=-8.5
We simplify the equation to the form, which is simple to understand
3m-8m+3=-8.5
We move all terms containing m to the left and all other terms to the right.
+3m-8m=-8.5-3
We simplify left and right side of the equation.
-5m=-11.5
We divide both sides of the equation by -5 to get m.
m=2.3
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