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r in (-oo:+oo)
5*r+15/20 = 4*r-(12/4) // - 4*r-(12/4)
5*r-(4*r)+15/20+12/4 = 0
5*r-4*r+15/20+12/4 = 0
r+15/4 = 0 // - 15/4
r = -15/4
r = -15/4
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