40/56=5/y

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Solution for 40/56=5/y equation: 


D( y )

y = 0

y = 0

y = 0

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

40/56 = 5/y // - 5/y

40/56-(5/y) = 0

40/56-5*y^-1 = 0

-5*y^-1 = -5/7 // : -5

y^-1 = 1/7

-1 < 0

1/(y^1) = 1/7 // * y^1

1 = 1/7*y^1 // : 1/7

7 = y^1

y = 7

y = 7

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