r-4+3r=16

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Solution for r-4+3r=16 equation: 



r-4+3r=16

We move all terms to the left:

r-4+3r-(16)=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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