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r in (-oo:+oo)
18/5-((31*r)/3) = r-(4*((10*r)/3-(2/5))) // - r-(4*((10*r)/3-(2/5)))
4*((10*r)/3-(2/5))-((31*r)/3)-r+18/5 = 0
4*((10*r)/3-2/5)+(-31/3)*r-r+18/5 = 0
4*(10/3*r-2/5)+(-31*r)/3-r+18/5 = 0
(3*4*5*(10/3*r-2/5))/(3*5)+(-31*5*r)/(3*5)+(3*5*(-r))/(3*5)+(3*18)/(3*5) = 0
3*4*5*(10/3*r-2/5)-31*5*r+3*5*(-r)+3*18 = 0
45*r-15*r-24+54 = 0
30*r-24+54 = 0
30*r+30 = 0
(30*r+30)/(3*5) = 0
(30*r+30)/(3*5) = 0 // * 3*5
30*r+30 = 0
30*r+30 = 0 // - 30
30*r = -30 // : 30
r = -30/30
r = -1
r = -1
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