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v in (-oo:+oo)
15*v^2-(((35*v)/5)*v^2)-(15*v) = 0
15*v^2-7*v^3-15*v = 0
15*v^2-7*v^3-15*v = 0
v*(15*v-7*v^2-15) = 0
15*v-7*v^2-15 = 0
DELTA = 15^2-(-15*(-7)*4)
DELTA = -195
DELTA < 0
v = 0
v = 0
v = 0
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