7/1=5/y

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Solution for 7/1=5/y equation: 


D( y )

y = 0

y = 0

y = 0

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

7/1 = 5/y // - 5/y

7/1-(5/y) = 0

7-5*y^-1 = 0

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

y^-1 = 7/5

-1 < 0

1/(y^1) = 7/5 // * y^1

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

5/7 = y^1

y = 5/7

y = 5/7

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