21/(x-8)=3

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Solution for 21/(x-8)=3 equation: 


D( x )

x-8 = 0

x-8 = 0

x-8 = 0

x-8 = 0 // + 8

x = 8

x in (-oo:8) U (8:+oo)

21/(x-8) = 3 // - 3

21/(x-8)-3 = 0

21/(x-8)+(-3*(x-8))/(x-8) = 0

21-3*(x-8) = 0

45-3*x = 0

(45-3*x)/(x-8) = 0

(45-3*x)/(x-8) = 0 // * x-8

45-3*x = 0

45-3*x = 0 // - 45

-3*x = -45 // : -3

x = -45/(-3)

x = 15

x = 15

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