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m-12.7=-21.7
We simplify the equation to the form, which is simple to understand
m-12.7=-21.7
We move all terms containing m to the left and all other terms to the right.
+1m=-21.7+12.7
We simplify left and right side of the equation.
+1m=-9
We divide both sides of the equation by 1 to get m.
m=-9
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