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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x+2)/x = 4.7 // - 4.7
(5*x+2)/x-4.7 = 0
(5*x+2)/x+(-4.7*x)/x = 0
5*x-4.7*x+2 = 0
0.3*x+2 = 0
(0.3*x+2)/x = 0
(0.3*x+2)/x = 0 // * x
0.3*x+2 = 0
0.3*x+2 = 0 // - 2
0.3*x = -2 // : 0.3
x = -2/0.3
x = -6.66666667
x = -6.66666667
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