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D( x )
x/7 <= 0
x/7 <= 0
x/7 <= 0
1/7*x+0 <= 0 // - 0
1/7*x <= 0 // : 1/7
x <= 0/1/7
x <= 0
x in (0:+oo)
2.6 = ln(x/7) // - ln(x/7)
2.6-ln(x/7) = 0
2.6-ln(x/7) = 0 // - 2.6
-ln(x/7) = -2.6
-ln(x/7) = -2.6 // * -1
ln(x/7) = ln(e^2.6)
x/7 = e^2.6
x/7-e^2.6 = 0
1/7*x-e^2.6 = 0 // + e^2.6
1/7*x = e^2.6 // : 1/7
x = (e^2.6)/1/7
x = 7*e^2.6
x = 7*e^2.6
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