420=2(9r+10)

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Solution for 420=2(9r+10) equation: 



420=2(9r+10)

We move all terms to the left:

420-(2(9r+10))=0



We calculate terms in parentheses: -(2(9r+10)), so:

2(9r+10)

We multiply parentheses

18r+20

Back to the equation:

-(18r+20)



We get rid of parentheses

-18r-20+420=0

We add all the numbers together, and all the variables

-18r+400=0

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

-18r=-400

r=-400/-18

r=22+2/9

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