20-2r=17

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Solution for 20-2r=17 equation: 



20-2r=17

We move all terms to the left:

20-2r-(17)=0

We add all the numbers together, and all the variables

-2r+3=0

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

-2r=-3

r=-3/-2

r=1+1/2

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