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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
10/4-((112*y)/4)-(3/y) = -5/14 // + -5/14
10/4-((112*y)/4)-(3/y)-(-5/14) = 0
10/4-28*y-3*y^-1+5/14 = 0
20/7*y^0-28*y^1-3*y^-1 = 0
(20/7*y^1-28*y^2-3*y^0)/(y^1) = 0 // * y^2
y^1*(20/7*y^1-28*y^2-3*y^0) = 0
y^1
(20/7)*y-28*y^2-3 = 0
(20/7)*y-28*y^2-3 = 0
DELTA = (20/7)^2-(-28*(-3)*4)
DELTA = -16064/49
DELTA < 0
y in { }
y belongs to the empty set
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