80-m=-20

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Solution for 80-m=-20 equation: 



80-m=-20

We move all terms to the left:

80-m-(-20)=0

We add all the numbers together, and all the variables

-1m+100=0

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

-m=-100

m=-100/-1

m=+100

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