20=15-m

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Solution for 20=15-m equation: 



20=15-m

We move all terms to the left:

20-(15-m)=0

We add all the numbers together, and all the variables

-(-1m+15)+20=0

We get rid of parentheses

1m-15+20=0

We add all the numbers together, and all the variables

m+5=0

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

m=-5

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