500-20m=220

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Solution for 500-20m=220 equation: 



500-20m=220

We move all terms to the left:

500-20m-(220)=0

We add all the numbers together, and all the variables

-20m+280=0

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

-20m=-280

m=-280/-20

m=+14

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