20r-13r+r-3r-r=16

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Solution for 20r-13r+r-3r-r=16 equation: 



20r-13r+r-3r-r=16

We move all terms to the left:

20r-13r+r-3r-r-(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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