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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.4/x = 2.17/7.7 // - 2.17/7.7
3.4/x-(2.17/7.7) = 0
3.4/x-0.28181818 = 0
3.4*x^-1 = 0.28181818 // : 3.4
x^-1 = 0.0828877
-1 < 0
1/(x^1) = 0.0828877 // * x^1
1 = 0.0828877*x^1 // : 0.0828877
12.06451621 = x^1
x = 12.06451621
x = 12.06451621
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