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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
41/28 = 7/x // - 7/x
41/28-(7/x) = 0
41/28-7*x^-1 = 0
-7*x^-1 = -41/28 // : -7
x^-1 = 41/196
-1 < 0
1/(x^1) = 41/196 // * x^1
1 = 41/196*x^1 // : 41/196
196/41 = x^1
x = 196/41
x = 196/41
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