420=2(r+100)

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Solution for 420=2(r+100) equation: 



420=2(r+100)

We move all terms to the left:

420-(2(r+100))=0



We calculate terms in parentheses: -(2(r+100)), so:

2(r+100)

We multiply parentheses

2r+200

Back to the equation:

-(2r+200)



We get rid of parentheses

-2r-200+420=0

We add all the numbers together, and all the variables

-2r+220=0

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

-2r=-220

r=-220/-2

r=+110

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