9r+7=7r+13

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Solution for 9r+7=7r+13 equation: 



9r+7=7r+13

We move all terms to the left:

9r+7-(7r+13)=0

We get rid of parentheses

9r-7r-13+7=0

We add all the numbers together, and all the variables

2r-6=0

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

2r=6

r=6/2

r=3

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