2000=4000/(18-x)

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Solution for 2000=4000/(18-x) equation: 


D( x )

18-x = 0

18-x = 0

18-x = 0

18-x = 0 // - 18

-x = -18 // * -1

x = 18

x in (-oo:18) U (18:+oo)

2000 = 4000/(18-x) // - 4000/(18-x)

2000-(4000/(18-x)) = 0

2000-4000*(18-x)^-1 = 0

2000-4000/(18-x) = 0

(2000*(18-x))/(18-x)-4000/(18-x) = 0

2000*(18-x)-4000 = 0

32000-2000*x = 0

(32000-2000*x)/(18-x) = 0

(32000-2000*x)/(18-x) = 0 // * 18-x

32000-2000*x = 0

32000-2000*x = 0 // - 32000

-2000*x = -32000 // : -2000

x = -32000/(-2000)

x = 16

x = 16

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