20=r+-5

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Solution for 20=r+-5 equation: 



20=r+-5

We move all terms to the left:

20-(r+-5)=0

We add all the numbers together, and all the variables

-(r-5)+20=0

We get rid of parentheses

-r+5+20=0

We add all the numbers together, and all the variables

-1r+25=0

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

-r=-25

r=-25/-1

r=+25

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