4/(7y)^(-2/3)

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Solution for 4/(7y)^(-2/3) equation: 


D( y )

(7*y)^(-2/3) = 0

7*y = 0

(7*y)^(-2/3) = 0

(7*y)^(-2/3) = 0

7^(-2/3)*y^(-2/3) = 0 // : 7^(-2/3)

y^(-2/3) = 0

y należy do O

7*y = 0

7*y = 0

7*y = 0 // : 7

y = 0

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

4/((7*y)^(-2/3)) = 0

(4/(7^(-2/3)))*y^(2/3) = 0 // : 4/(7^(-2/3))

y^(2/3) = 0

y = 0

y in { 0} 

y belongs to the empty set

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