3r+1+7r+9=180

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Solution for 3r+1+7r+9=180 equation: 



3r+1+7r+9=180

We move all terms to the left:

3r+1+7r+9-(180)=0

We add all the numbers together, and all the variables

10r-170=0

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

10r=170

r=170/10

r=17

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