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r in (-oo:+oo)
3*r+18/12 = 5*r-(1/19) // - 5*r-(1/19)
3*r-(5*r)+18/12+1/19 = 0
3*r-5*r+18/12+1/19 = 0
59/38-2*r = 0 // - 59/38
-2*r = -59/38 // : -2
r = -59/38/(-2)
r = 59/76
r = 59/76
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