20=25-r

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Solution for 20=25-r equation: 



20=25-r

We move all terms to the left:

20-(25-r)=0

We add all the numbers together, and all the variables

-(-1r+25)+20=0

We get rid of parentheses

1r-25+20=0

We add all the numbers together, and all the variables

r-5=0

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

r=5

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