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300m+500m=.9
We simplify the equation to the form, which is simple to understand
300m+500m=.9
We move all terms containing m to the left and all other terms to the right.
+300m+500m=0.9
We simplify left and right side of the equation.
+800m=0.9
We divide both sides of the equation by 800 to get m.
m=0.001125
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