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v in (-oo:+oo)
15*v^6-(v^2*((12*v^5)/3)) = 0
15*v^6-4*v^7 = 0
15*v^6-4*v^7 = 0
v^6*(15-4*v) = 0
15-4*v = 0 // - 15
-4*v = -15 // : -4
v = -15/(-4)
v = 15/4
v^6 = 0
1*v^6 = 0 // : 1
v^6 = 0
v = 0
v in { 15/4, 0 }
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