7=840/(x/40)

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Solution for 7=840/(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 = 840/(x/40) // - 840/(x/40)

7-(840/(x/40)) = 0

7-33600*x^-1 = 0

-33600*x^-1 = -7 // : -33600

x^-1 = 1/4800

-1 < 0

1/(x^1) = 1/4800 // * x^1

1 = 1/4800*x^1 // : 1/4800

4800 = x^1

x = 4800

x = 4800

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