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-21--5m=219
We simplify the equation to the form, which is simple to understand
-21+5m=219
We move all terms containing m to the left and all other terms to the right.
+5m=+219+21
We simplify left and right side of the equation.
+5m=+240
We divide both sides of the equation by 5 to get m.
m=48
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