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D( y )
3*y = 0
2*y = 0
3*y = 0
3*y = 0
3*y = 0 // : 3
y = 0
2*y = 0
2*y = 0
2*y = 0 // : 2
y = 0
y in (-oo:0) U (0:+oo)
(7*y)/3-y-((4*y)/3)-(5/(2*y))-(1/(3*y)) = 0
(7*y)/3-y+(-4/3)*y+(-5/2)*y^-1+(-1/3)*y^-1 = 0
-17/6*y^-1 = 0 // : -17/6
y^-1 = 0
y naleu017Cy do O
y belongs to the empty set
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