20-4r=12

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Solution for 20-4r=12 equation: 



20-4r=12

We move all terms to the left:

20-4r-(12)=0

We add all the numbers together, and all the variables

-4r+8=0

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

-4r=-8

r=-8/-4

r=+2

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