9(2r+1)=135

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Solution for 9(2r+1)=135 equation: 



9(2r+1)=135

We move all terms to the left:

9(2r+1)-(135)=0

We multiply parentheses

18r+9-135=0

We add all the numbers together, and all the variables

18r-126=0

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

18r=126

r=126/18

r=7

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