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D( x )
60-(4*x) < 0
60-(4*x) < 0
60-(4*x) < 0
60-4*x < 0
60-4*x < 0 // - 60
-4*x < -60 // : -4
x > -60/(-4)
x > 15
x in (-oo:15>
(60-(4*x))^(1/6) = 0
(60-4*x)^(1/6) = 0
60-4*x = 0 // - 60
-4*x = -60 // : -4
x = -60/(-4)
x = 15
x = 15
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