11r+12=9r+13

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Solution for 11r+12=9r+13 equation: 



11r+12=9r+13

We move all terms to the left:

11r+12-(9r+13)=0

We get rid of parentheses

11r-9r-13+12=0

We add all the numbers together, and all the variables

2r-1=0

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

2r=1

r=1/2

r=1/2

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