8r-12=4

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Solution for 8r-12=4 equation: 



8r-12=4

We move all terms to the left:

8r-12-(4)=0

We add all the numbers together, and all the variables

8r-16=0

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

8r=16

r=16/8

r=2

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