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r in (-oo:+oo)
2*r+12/8 = 4*r-(1/15) // - 4*r-(1/15)
2*r-(4*r)+12/8+1/15 = 0
2*r-4*r+12/8+1/15 = 0
47/30-2*r = 0 // - 47/30
-2*r = -47/30 // : -2
r = -47/30/(-2)
r = 47/60
r = 47/60
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