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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.25/x-3 = 10 // - 10
2.25/x-10-3 = 0
2.25*x^-1 = 13 // : 2.25
x^-1 = 5.77777778
-1 < 0
1/(x^1) = 5.77777778 // * x^1
1 = 5.77777778*x^1 // : 5.77777778
0.17307692 = x^1
x = 0.17307692
x = 0.17307692
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