0.2=4/(5x-15)

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Solution for 0.2=4/(5x-15) equation: 


D( x )

5*x-15 = 0

5*x-15 = 0

5*x-15 = 0

5*x-15 = 0 // + 15

5*x = 15 // : 5

x = 15/5

x = 3

x in (-oo:3) U (3:+oo)

0.2 = 4/(5*x-15) // - 4/(5*x-15)

0.2-(4/(5*x-15)) = 0

0.2-4*(5*x-15)^-1 = 0

0.2-4/(5*x-15) = 0

(0.2*(5*x-15))/(5*x-15)-4/(5*x-15) = 0

0.2*(5*x-15)-4 = 0

x-7 = 0

(x-7)/(5*x-15) = 0

(x-7)/(5*x-15) = 0 // * 5*x-15

x-7 = 0

x-7 = 0 // + 7

x = 7

x = 7

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