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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
3/4 = 12/(x-5) // - 12/(x-5)
3/4-(12/(x-5)) = 0
3/4-12*(x-5)^-1 = 0
3/4-12/(x-5) = 0
(-12*4)/(4*(x-5))+(3*(x-5))/(4*(x-5)) = 0
3*(x-5)-12*4 = 0
3*x-63 = 0
(3*x-63)/(4*(x-5)) = 0
(3*x-63)/(4*(x-5)) = 0 // * 4*(x-5)
3*x-63 = 0
3*x-63 = 0 // + 63
3*x = 63 // : 3
x = 63/3
x = 21
x = 21
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