420=2r+10

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Solution for 420=2r+10 equation: 



420=2r+10

We move all terms to the left:

420-(2r+10)=0

We get rid of parentheses

-2r-10+420=0

We add all the numbers together, and all the variables

-2r+410=0

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

-2r=-410

r=-410/-2

r=+205

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