20-2r=4

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Solution for 20-2r=4 equation: 



20-2r=4

We move all terms to the left:

20-2r-(4)=0

We add all the numbers together, and all the variables

-2r+16=0

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

-2r=-16

r=-16/-2

r=+8

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