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4=-4r+5

We move all terms to the left:

4-(-4r+5)=0

We get rid of parentheses

4r-5+4=0

We add all the numbers together, and all the variables

4r-1=0

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

4r=1

r=1/4

r=1/4

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