1/15+1/20=12/x

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Solution for 1/15+1/20=12/x equation: 


D( x )

x = 0

x = 0

x = 0

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

1/15+1/20 = 12/x // - 12/x

1/15-(12/x)+1/20 = 0

1/15-12*x^-1+1/20 = 0

-12*x^-1 = -7/60 // : -12

x^-1 = 7/720

-1 < 0

1/(x^1) = 7/720 // * x^1

1 = 7/720*x^1 // : 7/720

720/7 = x^1

x = 720/7

x = 720/7

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