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