20-13r=9-6r+4

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Solution for 20-13r=9-6r+4 equation: 



20-13r=9-6r+4

We move all terms to the left:

20-13r-(9-6r+4)=0

We add all the numbers together, and all the variables

-13r-(-6r+13)+20=0

We get rid of parentheses

-13r+6r-13+20=0

We add all the numbers together, and all the variables

-7r+7=0

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

-7r=-7

r=-7/-7

r=1

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