5/21=2/7/y

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Solution for 5/21=2/7/y equation: 


D( y )

y = 0

y = 0

y = 0

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

5/21 = (2/7)/y // - (2/7)/y

5/21-((2/7)/y) = 0

(-2/7)*y^-1+5/21 = 0

-2/7*y^-1 = -5/21 // : -2/7

y^-1 = 5/6

-1 < 0

1/(y^1) = 5/6 // * y^1

1 = 5/6*y^1 // : 5/6

6/5 = y^1

y = 6/5

y = 6/5

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