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D( x )
4*x = 0
x-14 = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x-14 = 0
x-14 = 0
x-14 = 0 // + 14
x = 14
x in (-oo:0) U (0:14) U (14:+oo)
2/(x-14) = 3/(4*x) // - 3/(4*x)
2/(x-14)-(3/(4*x)) = 0
2/(x-14)+(-3/4)*x^-1 = 0
2/(x-14)-3/(4*x) = 0
(2*4*x)/(4*x*(x-14))+(-3*(x-14))/(4*x*(x-14)) = 0
2*4*x-3*(x-14) = 0
5*x+42 = 0
(5*x+42)/(4*x*(x-14)) = 0
(5*x+42)/(4*x*(x-14)) = 0 // * 4*x*(x-14)
5*x+42 = 0
5*x+42 = 0 // - 42
5*x = -42 // : 5
x = -42/5
x = -42/5
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