2/3=7/y

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Solution for 2/3=7/y equation: 


D( y )

y = 0

y = 0

y = 0

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

2/3 = 7/y // - 7/y

2/3-(7/y) = 0

2/3-7*y^-1 = 0

-7*y^-1 = -2/3 // : -7

y^-1 = 2/21

-1 < 0

1/(y^1) = 2/21 // * y^1

1 = 2/21*y^1 // : 2/21

21/2 = y^1

y = 21/2

y = 21/2

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