20+m=-m

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Solution for 20+m=-m equation: 



20+m=-m

We move all terms to the left:

20+m-(-m)=0

We add all the numbers together, and all the variables

m-(-1m)+20=0

We get rid of parentheses

m+1m+20=0

We add all the numbers together, and all the variables

2m+20=0

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

2m=-20

m=-20/2

m=-10

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