4(r+9)=80

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Solution for 4(r+9)=80 equation: 



4(r+9)=80

We move all terms to the left:

4(r+9)-(80)=0

We multiply parentheses

4r+36-80=0

We add all the numbers together, and all the variables

4r-44=0

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

4r=44

r=44/4

r=11

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