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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*12.5)/x+8 = 32 // - 32
(3*12.5)/x-32+8 = 0
37.5*x^-1 = 24 // : 37.5
x^-1 = 0.64
-1 < 0
1/(x^1) = 0.64 // * x^1
1 = 0.64*x^1 // : 0.64
1.5625 = x^1
x = 1.5625
x = 1.5625
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