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y in (-oo:+oo)
11*y-((y/5)*y)+3*y = 0
(-1/5)*y^2+11*y+3*y = 0
14*y-1/5*y^2 = 0
DELTA = 14^2-(-1/5*0*4)
DELTA = 196
DELTA > 0
y = (196^(1/2)-14)/(-1/5*2) or y = (-196^(1/2)-14)/(-1/5*2)
y = 0 or y = 70
y in { 0, 70 }
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