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r in (-oo:+oo)
5-((18*r)/5) = r/5-(4*((4*r)/5+1/4)) // - r/5-(4*((4*r)/5+1/4))
4*((4*r)/5+1/4)-((18*r)/5)-(r/5)+5 = 0
4*((4*r)/5+1/4)+(-18/5)*r-(r/5)+5 = 0
4*(4/5*r+1/4)+(-18*r)/5-r/5+5 = 0
(4*5*(4/5*r+1/4))/5+(-18*r)/5-r/5+(5^2)/5 = 0
4*5*(4/5*r+1/4)-18*r-r+25 = 0
5-2*r-r+25 = 0
5-3*r+25 = 0
30-3*r = 0
(30-3*r)/5 = 0
(30-3*r)/5 = 0 // * 5
30-3*r = 0
30-3*r = 0 // - 30
-3*r = -30 // : -3
r = -30/(-3)
r = 10
r = 10
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