20r-6r-2r+4r-9r=7

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Solution for 20r-6r-2r+4r-9r=7 equation: 



20r-6r-2r+4r-9r=7

We move all terms to the left:

20r-6r-2r+4r-9r-(7)=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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