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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-(7/2) = -31/10 // + -31/10
2/x-(7/2)-(-31/10) = 0
2/x-7/2+31/10 = 0
2*x^-1 = 2/5 // : 2
x^-1 = 1/5
-1 < 0
1/(x^1) = 1/5 // * x^1
1 = 1/5*x^1 // : 1/5
5 = x^1
x = 5
x = 5
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