2r+4+r+5=180

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Solution for 2r+4+r+5=180 equation: 



2r+4+r+5=180

We move all terms to the left:

2r+4+r+5-(180)=0

We add all the numbers together, and all the variables

3r-171=0

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

3r=171

r=171/3

r=57

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