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r in (-oo:+oo)
3*r+9/6 = 5*r-(15/5) // - 5*r-(15/5)
3*r-(5*r)+9/6+15/5 = 0
3*r-5*r+9/6+15/5 = 0
9/2-2*r = 0 // - 9/2
-2*r = -9/2 // : -2
r = -9/2/(-2)
r = 9/4
r = 9/4
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