4(9+r)=108

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Solution for 4(9+r)=108 equation: 



4(9+r)=108

We move all terms to the left:

4(9+r)-(108)=0

We add all the numbers together, and all the variables

4(r+9)-108=0

We multiply parentheses

4r+36-108=0

We add all the numbers together, and all the variables

4r-72=0

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

4r=72

r=72/4

r=18

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