3-12/x=7

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Solution for 3-12/x=7 equation: 


D( x )

x = 0

x = 0

x = 0

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

3-(12/x) = 7 // - 7

3-(12/x)-7 = 0

3-12*x^-1-7 = 0

-12*x^-1 = 4 // : -12

x^-1 = -1/3

-1 < 0

1/(x^1) = -1/3 // * x^1

1 = -1/3*x^1 // : -1/3

-3 = x^1

x = -3

x = -3

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