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r in (-oo:+oo)
4*r-32/5 = (2/5)*(-5*r-1) // - (2/5)*(-5*r-1)
4*r-((2/5)*(-5*r-1))-32/5 = 0
(-2/5)*(-5*r-1)+4*r-32/5 = 0
4*r-2/5*(-5*r-1)-32/5 = 0
(-2/5*5*(-5*r-1))/5+(4*5*r)/5-32/5 = 0
4*5*r-2/5*5*(-5*r-1)-32 = 0
30*r-32+2 = 0
30*r-30 = 0
(30*r-30)/5 = 0
(30*r-30)/5 = 0 // * 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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