X-7/x=90

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Solution for X-7/x=90 equation: 


D( x )

x = 0

x = 0

x = 0

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

X-(7/x) = 90 // - 90

X-(7/x)-90 = 0

X-7*x^-1-90 = 0

-7*x^-1 = -(X-90) // : -7

x^-1 = (90-X)/(-7)

-1 < 0

1/(x^1) = (90-X)/(-7) // * x^1

1 = x^1*((90-X)/(-7)) // : (90-X)/(-7)

-7*(90-X)^-1 = x^1

x = -7*(90-X)^-1

x = -7*(90-X)^-1

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