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r in (-oo:+oo)
4*r+16/12 = 5*r-(30/5) // - 5*r-(30/5)
4*r-(5*r)+16/12+30/5 = 0
4*r-5*r+16/12+30/5 = 0
22/3-r = 0 // - 22/3
-r = -22/3 // * -1
r = 22/3
r = 22/3
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