8r-4r=-16

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Solution for 8r-4r=-16 equation: 



8r-4r=-16

We move all terms to the left:

8r-4r-(-16)=0

We add all the numbers together, and all the variables

4r+16=0

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

4r=-16

r=-16/4

r=-4

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