(5t-20)/(4-t)

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Solution for (5t-20)/(4-t) equation: 


D( t )

4-t = 0

4-t = 0

4-t = 0

4-t = 0 // - 4

-t = -4 // * -1

t = 4

t in (-oo:4) U (4:+oo)

(5*t-20)/(4-t) = 0

5*t-20 = 0 // + 20

5*t = 20 // : 5

t = 20/5

t = 4

t in { 4} 

t belongs to the empty set

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