(x-15)/(x-3)=2/3

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Solution for (x-15)/(x-3)=2/3 equation: 


D( x )

x-3 = 0

x-3 = 0

x-3 = 0

x-3 = 0 // + 3

x = 3

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

(x-15)/(x-3) = 2/3 // - 2/3

(x-15)/(x-3)-(2/3) = 0

(x-15)/(x-3)-2/3 = 0

(3*(x-15))/(3*(x-3))+(-2*(x-3))/(3*(x-3)) = 0

3*(x-15)-2*(x-3) = 0

x-39 = 0

(x-39)/(3*(x-3)) = 0

(x-39)/(3*(x-3)) = 0 // * 3*(x-3)

x-39 = 0

x-39 = 0 // + 39

x = 39

x = 39

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