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D( x )
7*x-2 = 0
7*x-2 = 0
7*x-2 = 0
7*x-2 = 0 // + 2
7*x = 2 // : 7
x = 2/7
x in (-oo:2/7) U (2/7:+oo)
(-4*e^7*x)/(7*x-2) = 0
-4*e^7*x = 0 // : -4*e^7
x = 0
x = 0
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