12r-9r-3r+4r=20

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Solution for 12r-9r-3r+4r=20 equation: 



12r-9r-3r+4r=20

We move all terms to the left:

12r-9r-3r+4r-(20)=0

We add all the numbers together, and all the variables

4r-20=0

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

4r=20

r=20/4

r=5

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