20=r+16

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Solution for 20=r+16 equation: 



20=r+16

We move all terms to the left:

20-(r+16)=0

We get rid of parentheses

-r-16+20=0

We add all the numbers together, and all the variables

-1r+4=0

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

-r=-4

r=-4/-1

r=+4

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