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m + 0.9 + 0.5m=-2.1
We simplify the equation to the form, which is simple to understand
m + 0.9 + 0.5m=-2.1
We move all terms containing m to the left and all other terms to the right.
+1m + 0.5m=-2.1-0.9
We simplify left and right side of the equation.
+1.5m=-3
We divide both sides of the equation by 1.5 to get m.
m=-2
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