-4=r.20-5

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Solution for -4=r.20-5 equation: 



-4=r.20-5

We move all terms to the left:

-4-(r.20-5)=0

We get rid of parentheses

-r.20+5-4=0

We add all the numbers together, and all the variables

-r.20+1=0

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

-r.20=-1

r=-1/1

r=-1

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