3r+4=-8

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Solution for 3r+4=-8 equation: 



3r+4=-8

We move all terms to the left:

3r+4-(-8)=0

We add all the numbers together, and all the variables

3r+12=0

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

3r=-12

r=-12/3

r=-4

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