20=4(r+1)

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Solution for 20=4(r+1) equation: 



20=4(r+1)

We move all terms to the left:

20-(4(r+1))=0



We calculate terms in parentheses: -(4(r+1)), so:

4(r+1)

We multiply parentheses

4r+4

Back to the equation:

-(4r+4)



We get rid of parentheses

-4r-4+20=0

We add all the numbers together, and all the variables

-4r+16=0

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

-4r=-16

r=-16/-4

r=+4

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