7=840/x

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Solution for 7=840/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7 = 840/x // - 840/x

7-(840/x) = 0

7-840*x^-1 = 0

-840*x^-1 = -7 // : -840

x^-1 = 1/120

-1 < 0

1/(x^1) = 1/120 // * x^1

1 = 1/120*x^1 // : 1/120

120 = x^1

x = 120

x = 120

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