(1/28)+(1/21)=(1/x)

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Solution for (1/28)+(1/21)=(1/x) equation: 


D( x )

x = 0

x = 0

x = 0

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

1/28+1/21 = 1/x // - 1/x

1/28-(1/x)+1/21 = 0

1/28-x^-1+1/21 = 0

-1*x^-1 = -1/12 // : -1

x^-1 = 1/12

-1 < 0

1/(x^1) = 1/12 // * x^1

1 = 1/12*x^1 // : 1/12

12 = x^1

x = 12

x = 12

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