x+1/X=90 - solution

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Solution for x+1/X=90 equation:

x in (-oo:+oo)

1/X+x = 90 // - 90

1/X+x-90 = 0

X^-1+x-90 = 0 // - X^-1-90

x = -(X^-1-90)

x = 90-X^-1

x = 90-X^-1

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