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5r-4+3r-11+2r-5=180
We move all terms to the left:
5r-4+3r-11+2r-5-(180)=0
We add all the numbers together, and all the variables
10r-200=0
We move all terms containing r to the left, all other terms to the right
10r=200
r=200/10
r=20
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