12r-16r=-20

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Solution for 12r-16r=-20 equation: 



12r-16r=-20

We move all terms to the left:

12r-16r-(-20)=0

We add all the numbers together, and all the variables

-4r+20=0

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

-4r=-20

r=-20/-4

r=+5

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