80=4/(0.13-X)

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Solution for 80=4/(0.13-X) equation: 


D( X )

0.13-X = 0

0.13-X = 0

0.13-X = 0

0.13-X = 0 // - 0.13

-X = -0.13 // * -1

X = 0.13

X in (-oo:0.13) U (0.13:+oo)

80 = 4/(0.13-X) // - 4/(0.13-X)

80-(4/(0.13-X)) = 0

80-4*(0.13-X)^-1 = 0

80-4/(0.13-X) = 0

(80*(0.13-X))/(0.13-X)-4/(0.13-X) = 0

80*(0.13-X)-4 = 0

6.4-80*X = 0

(6.4-80*X)/(0.13-X) = 0

(6.4-80*X)/(0.13-X) = 0 // * 0.13-X

6.4-80*X = 0

6.4-80*X = 0 // - 6.4

-80*X = -6.4 // : -80

X = -6.4/(-80)

X = 0.08

X = 0.08

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