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