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D( x )
7*x = 0
7*x = 0
7*x = 0
7*x = 0 // : 7
x = 0
x in (-oo:0) U (0:+oo)
6/(7*x)+1/4 = 0
6/7*x^-1 = -1/4 // : 6/7
x^-1 = -7/24
-1 < 0
1/(x^1) = -7/24 // * x^1
1 = -7/24*x^1 // : -7/24
-24/7 = x^1
x = -24/7
x = -24/7
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