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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8*x)/x-((6*x)/7)-x-7 = 0
(-6/7)*x-x+(8*x)/x-7 = 0
1-13/7*x = 0 // - 1
-13/7*x = -1 // : -13/7
x = -1/(-13/7)
x = 7/13
x = 7/13
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