-2r+20+12r+12-8r=68

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Solution for -2r+20+12r+12-8r=68 equation: 



-2r+20+12r+12-8r=68

We move all terms to the left:

-2r+20+12r+12-8r-(68)=0

We add all the numbers together, and all the variables

2r-36=0

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

2r=36

r=36/2

r=18

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