40=4-2m

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Solution for 40=4-2m equation: 



40=4-2m

We move all terms to the left:

40-(4-2m)=0

We add all the numbers together, and all the variables

-(-2m+4)+40=0

We get rid of parentheses

2m-4+40=0

We add all the numbers together, and all the variables

2m+36=0

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

2m=-36

m=-36/2

m=-18

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