21/(y-8)=3

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


D( y )

y-8 = 0

y-8 = 0

y-8 = 0

y-8 = 0 // + 8

y = 8

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

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

21/(y-8)-3 = 0

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

21-3*(y-8) = 0

45-3*y = 0

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

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

45-3*y = 0

45-3*y = 0 // - 45

-3*y = -45 // : -3

y = -45/(-3)

y = 15

y = 15

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