7r-8+5r+8=180

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Solution for 7r-8+5r+8=180 equation: 



7r-8+5r+8=180

We move all terms to the left:

7r-8+5r+8-(180)=0

We add all the numbers together, and all the variables

12r-180=0

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

12r=180

r=180/12

r=15

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