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r in (-oo:+oo)
5*r+40/15 = 2*r-(8/2) // - 2*r-(8/2)
5*r-(2*r)+40/15+8/2 = 0
5*r-2*r+40/15+8/2 = 0
3*r+20/3 = 0 // - 20/3
3*r = -20/3 // : 3
r = -20/3/3
r = -20/9
r = -20/9
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