(3x-12)/(28-7x)

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Solution for (3x-12)/(28-7x) equation: 


D( x )

28-(7*x) = 0

28-(7*x) = 0

28-(7*x) = 0

28-7*x = 0

28-7*x = 0 // - 28

-7*x = -28 // : -7

x = -28/(-7)

x = 4

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

(3*x-12)/(28-(7*x)) = 0

(3*x-12)/(28-7*x) = 0

3*x-12 = 0 // + 12

3*x = 12 // : 3

x = 12/3

x = 4

x in { 4} 

x belongs to the empty set

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