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v in (-oo:+oo)
(-7/4)*v^3-((5/6)*v^2) = 0
(-7/4)*v^3+(-5/6)*v^2 = 0
-7/4*v^3-5/6*v^2 = 0
-1/2*v^2*(7/2*v+5/3) = 0
7/2*v+5/3 = 0 // - 5/3
7/2*v = -5/3 // : 7/2
v = -5/3/7/2
v = -10/21
(-v^2)/2 = 0
-1/2*v^2 = 0 // : -1/2
v^2 = 0
v = 0
v in { -10/21, 0 }
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