240=2(r+10)

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Solution for 240=2(r+10) equation: 



240=2(r+10)

We move all terms to the left:

240-(2(r+10))=0



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

2(r+10)

We multiply parentheses

2r+20

Back to the equation:

-(2r+20)



We get rid of parentheses

-2r-20+240=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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