18-2r+4r=180

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Solution for 18-2r+4r=180 equation: 



18-2r+4r=180

We move all terms to the left:

18-2r+4r-(180)=0

We add all the numbers together, and all the variables

2r-162=0

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

2r=162

r=162/2

r=81

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