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D( x )
5*7*x = 0
5*7*x = 0
5*7*x = 0
35*x = 0 // : 35
x = 0
x in (-oo:0) U (0:+oo)
1.2/(5*7*x) = 2.7 // - 2.7
1.2/(5*7*x)-2.7 = 0
0.03428571*x^-1 = 2.7 // : 0.03428571
x^-1 = 78.75000984
-1 < 0
1/(x^1) = 78.75000984 // * x^1
1 = 78.75000984*x^1 // : 78.75000984
0.01269841 = x^1
x = 0.01269841
x = 0.01269841
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