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v in (-oo:+oo)
(-4/5)*v^3-((3/4)*v^2) = 0
(-4/5)*v^3+(-3/4)*v^2 = 0
-4/5*v^3-3/4*v^2 = 0
-v^2*(4/5*v+3/4) = 0
4/5*v+3/4 = 0 // - 3/4
4/5*v = -3/4 // : 4/5
v = -3/4/4/5
v = -15/16
-v^2 = 0
-1*v^2 = 0 // : -1
v^2 = 0
v = 0
v in { -15/16, 0 }
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