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15=m+3-5m
We simplify the equation to the form, which is simple to understand
15=m+3-5m
We move all terms containing m to the left and all other terms to the right.
-1m+5m=+3-15
We simplify left and right side of the equation.
+4m=-12
We divide both sides of the equation by 4 to get m.
m=-3
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