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r in (-oo:+oo)
r*((16*r^3)/2)-(r*((12*r^2)/2)) = 0
r*((16*r^3)/2)-6*r^3 = 0
8*r^4-6*r^3 = 0
2*r^3*(4*r-3) = 0
4*r-3 = 0 // + 3
4*r = 3 // : 4
r = 3/4
2*r^3 = 0
2*r^3 = 0 // : 2
r^3 = 0
r = 0
r in { 3/4, 0 }
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