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r in (-oo:+oo)
3*r+18/12 = 4*r-(1/15) // - 4*r-(1/15)
3*r-(4*r)+18/12+1/15 = 0
3*r-4*r+18/12+1/15 = 0
47/30-r = 0 // - 47/30
-r = -47/30 // * -1
r = 47/30
r = 47/30
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