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D( x )
2*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
7/(2*x) = 11 // - 11
7/(2*x)-11 = 0
7/2*x^-1 = 11 // : 7/2
x^-1 = 22/7
-1 < 0
1/(x^1) = 22/7 // * x^1
1 = 22/7*x^1 // : 22/7
7/22 = x^1
x = 7/22
x = 7/22
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