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v in (-oo:+oo)
15*v^5-(v^2*((18*v^4)/3)) = 0
15*v^5-6*v^6 = 0
15*v^5-6*v^6 = 0
3*v^5*(5-2*v) = 0
5-2*v = 0 // - 5
-2*v = -5 // : -2
v = -5/(-2)
v = 5/2
3*v^5 = 0
3*v^5 = 0 // : 3
v^5 = 0
v = 0
v in { 5/2, 0 }
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