0.3=(x-12)/x

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Solution for 0.3=(x-12)/x equation: 


D( x )

x = 0

x = 0

x = 0

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

0.3 = (x-12)/x // - (x-12)/x

0.3-((x-12)/x) = 0

(-1*(x-12))/x+0.3 = 0

(-1*(x-12))/x+(0.3*x)/x = 0

0.3*x-1*(x-12) = 0

12-0.7*x = 0

(12-0.7*x)/x = 0

(12-0.7*x)/x = 0 // * x

12-0.7*x = 0

12-0.7*x = 0 // - 12

-0.7*x = -12 // : -0.7

x = -12/(-0.7)

x = 17.14285714

x = 17.14285714

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