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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(-5/6)/x = (-1/22)/3 // - (-1/22)/3
(-5/6)/x-((-1/22)/3) = 0
(-5/6)/x+1/66 = 0
-5/6*x^-1 = -1/66 // : -5/6
x^-1 = 1/55
-1 < 0
1/(x^1) = 1/55 // * x^1
1 = 1/55*x^1 // : 1/55
55 = x^1
x = 55
x = 55
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