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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
26/x = 5-1.5 // - 5-1.5
26/x-5+1.5 = 0
26*x^-1 = 3.5 // : 26
x^-1 = 0.13461538
-1 < 0
1/(x^1) = 0.13461538 // * x^1
1 = 0.13461538*x^1 // : 0.13461538
7.42857168 = x^1
x = 7.42857168
x = 7.42857168
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