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y in (-oo:+oo)
(2/17)*y^2-((1/5)*y) = 0
(2/17)*y^2+(-1/5)*y = 0
2/17*y^2-1/5*y = 0
DELTA = (-1/5)^2-(0*2/17*4)
DELTA = 1/25
DELTA > 0
y = ((1/25)^(1/2)+1/5)/(2/17*2) or y = (1/5-(1/25)^(1/2))/(2/17*2)
y = 17/10 or y = 0
y in { 0, 17/10 }
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