20=r+25

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Solution for 20=r+25 equation: 



20=r+25

We move all terms to the left:

20-(r+25)=0

We get rid of parentheses

-r-25+20=0

We add all the numbers together, and all the variables

-1r-5=0

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

-r=5

r=5/-1

r=-5

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