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D( x )
x+43+57+62 = 0
x+43+57+62 = 0
x+43+57+62 = 0
x+162 = 0 // - 162
x = -162
x in (-oo:-162) U (-162:+oo)
4/(x+43+57+62) = 55 // - 55
4/(x+43+57+62)-55 = 0
4/(x+162)-55 = 0
4/(x+162)+(-55*(x+162))/(x+162) = 0
4-55*(x+162) = 0
-55*x-8906 = 0
(-55*x-8906)/(x+162) = 0
(-55*x-8906)/(x+162) = 0 // * x+162
-55*x-8906 = 0
-55*x-8906 = 0 // + 8906
-55*x = 8906 // : -55
x = 8906/(-55)
x = -8906/55
x = -8906/55
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