((30x-300)/(600-20x))=1

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Solution for ((30x-300)/(600-20x))=1 equation: 


D( x )

600-(20*x) = 0

600-(20*x) = 0

600-(20*x) = 0

600-20*x = 0

600-20*x = 0 // - 600

-20*x = -600 // : -20

x = -600/(-20)

x = 30

x in (-oo:30) U (30:+oo)

(30*x-300)/(600-(20*x)) = 1 // - 1

(30*x-300)/(600-(20*x))-1 = 0

(30*x-300)/(600-20*x)-1 = 0

(30*x-300)/(600-20*x)+(-1*(600-20*x))/(600-20*x) = 0

30*x-1*(600-20*x)-300 = 0

50*x-900 = 0

(50*x-900)/(600-20*x) = 0

(50*x-900)/(600-20*x) = 0 // * 600-20*x

50*x-900 = 0

50*x-900 = 0 // + 900

50*x = 900 // : 50

x = 900/50

x = 18

x = 18

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