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-m+5+21m+35=0
We simplify the equation to the form, which is simple to understand
-m+5+21m+35=0
We move all terms containing m to the left and all other terms to the right.
-1m+21m=0-5-35
We simplify left and right side of the equation.
+20m=-40
We divide both sides of the equation by 20 to get m.
m=-2
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