0.8=(x-30)/x

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Solution for 0.8=(x-30)/x equation: 


D( x )

x = 0

x = 0

x = 0

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

0.8 = (x-30)/x // - (x-30)/x

0.8-((x-30)/x) = 0

(-1*(x-30))/x+0.8 = 0

(-1*(x-30))/x+(0.8*x)/x = 0

0.8*x-1*(x-30) = 0

30-0.2*x = 0

(30-0.2*x)/x = 0

(30-0.2*x)/x = 0 // * x

30-0.2*x = 0

30-0.2*x = 0 // - 30

-0.2*x = -30 // : -0.2

x = -30/(-0.2)

x = 150

x = 150

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