4r=r+90

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Solution for 4r=r+90 equation: 



4r=r+90

We move all terms to the left:

4r-(r+90)=0

We get rid of parentheses

4r-r-90=0

We add all the numbers together, and all the variables

3r-90=0

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

3r=90

r=90/3

r=30

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