-12+2r=20

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Solution for -12+2r=20 equation: 



-12+2r=20

We move all terms to the left:

-12+2r-(20)=0

We add all the numbers together, and all the variables

2r-32=0

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

2r=32

r=32/2

r=16

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