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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
1/(x-3)-4 = 22/7 // - 22/7
1/(x-3)-(22/7)-4 = 0
1/(x-3)-22/7-4 = 0
(1*7)/(7*(x-3))+(-22*(x-3))/(7*(x-3))+(-4*7*(x-3))/(7*(x-3)) = 0
1*7-22*(x-3)-4*7*(x-3) = 0
73-22*x-28*x+84 = 0
157-50*x = 0
(157-50*x)/(7*(x-3)) = 0
(157-50*x)/(7*(x-3)) = 0 // * 7*(x-3)
157-50*x = 0
157-50*x = 0 // - 157
-50*x = -157 // : -50
x = -157/(-50)
x = 157/50
x = 157/50
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