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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-5.7 = 141.5/x-131.5 // - 141.5/x-131.5
131.5-(141.5/x)-5.7 = 0
131.5-141.5*x^-1-5.7 = 0
-141.5*x^-1 = -125.8 // : -141.5
x^-1 = 0.88904594
-1 < 0
1/(x^1) = 0.88904594 // * x^1
1 = 0.88904594*x^1 // : 0.88904594
1.12480127 = x^1
x = 1.12480127
x = 1.12480127
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