7=1200/(x/40)

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Solution for 7=1200/(x/40) equation: 


D( x )

x/40 = 0

x/40 = 0

x/40 = 0

1/40*x = 0 // : 1/40

x = 0

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

7 = 1200/(x/40) // - 1200/(x/40)

7-(1200/(x/40)) = 0

7-48000*x^-1 = 0

-48000*x^-1 = -7 // : -48000

x^-1 = 7/48000

-1 < 0

1/(x^1) = 7/48000 // * x^1

1 = 7/48000*x^1 // : 7/48000

48000/7 = x^1

x = 48000/7

x = 48000/7

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