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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
56/8 = 84/x // - 84/x
56/8-(84/x) = 0
56/8-84*x^-1 = 0
-84*x^-1 = -7 // : -84
x^-1 = 1/12
-1 < 0
1/(x^1) = 1/12 // * x^1
1 = 1/12*x^1 // : 1/12
12 = x^1
x = 12
x = 12
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