18r+2r-12r+r-r=16

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Solution for 18r+2r-12r+r-r=16 equation: 



18r+2r-12r+r-r=16

We move all terms to the left:

18r+2r-12r+r-r-(16)=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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