8r+12r=80

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Solution for 8r+12r=80 equation: 



8r+12r=80

We move all terms to the left:

8r+12r-(80)=0

We add all the numbers together, and all the variables

20r-80=0

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

20r=80

r=80/20

r=4

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