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r in (-oo:+oo)
3*r-(6*(9-3)*(3-(5*r)))+(9*r)/3-7+10 = 0
3*r-6*(9-3)*(3-5*r)+(9*r)/3-7+10 = 0
3*r-36*(3-5*r)+3*r-7+10 = 0
3*r-36*(3-5*r)+3*r-7+10 = 0
183*r+3*r-108-7+10 = 0
186*r-108-7+10 = 0
186*r-115+10 = 0
186*r-105 = 0
186*r-105 = 0
186*r-105 = 0 // + 105
186*r = 105 // : 186
r = 105/186
r = 35/62
r = 35/62
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