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v in (-oo:+oo)
3*v^2-((7/6)*v^2)+20*v+30*v-84 = 0
3*v^2+(-7/6)*v^2+20*v+30*v-84 = 0
11/6*v^2+50*v-84 = 0
DELTA = 50^2-(-84*11/6*4)
DELTA = 3116
DELTA > 0
v = (3116^(1/2)-50)/(11/6*2) or v = (-3116^(1/2)-50)/(11/6*2)
v = 3/11*(2*779^(1/2)-50) or v = 3/11*(-2*779^(1/2)-50)
v in { 3/11*(-2*779^(1/2)-50), 3/11*(2*779^(1/2)-50) }
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