y^2/7-y

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Solution for y^2/7-y equation: 


y in (-oo:+oo)

(y^2)/7-y = 0

1/7*y^2-y = 0

DELTA = (-1)^2-(0*1/7*4)

DELTA = 1

DELTA > 0

y = (1^(1/2)+1)/(1/7*2) or y = (1-1^(1/2))/(1/7*2)

y = 7 or y = 0

y in { 0, 7 }

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