20=10-2m

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Solution for 20=10-2m equation: 



20=10-2m

We move all terms to the left:

20-(10-2m)=0

We add all the numbers together, and all the variables

-(-2m+10)+20=0

We get rid of parentheses

2m-10+20=0

We add all the numbers together, and all the variables

2m+10=0

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

2m=-10

m=-10/2

m=-5

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