7/y-4/y

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Solution for 7/y-4/y equation: 


D( y )

y = 0

y = 0

y = 0

y in (-oo:0) U (0:+oo)

7/y-(4/y) = 0

7/y-4*y^-1 = 0

3*y^-1 = 0 // : 3

y^-1 = 0

y naleu017Cy do O

y belongs to the empty set

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