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r in (-oo:+oo)
3*r+9/12 = 4*r-(1/15) // - 4*r-(1/15)
3*r-(4*r)+9/12+1/15 = 0
3*r-4*r+9/12+1/15 = 0
49/60-r = 0 // - 49/60
-r = -49/60 // * -1
r = 49/60
r = 49/60
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