31.5=-2.1m-4.2m

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Solution for 31.5=-2.1m-4.2m equation: 



31.5=-2.1m-4.2m

We move all terms to the left:

31.5-(-2.1m-4.2m)=0

We add all the numbers together, and all the variables

-(-6.3m)+31.5=0

We get rid of parentheses

6.3m+31.5=0

We move all terms containing m to the left, all other terms to the right

6.3m=-31.5

m=-31.5/6.3

m=-5

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