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D( x )
4*x-8 < 0
4*x-8 < 0
4*x-8 < 0
4*x-8 < 0 // + 8
4*x < 8 // : 4
x < 8/4
x < 2
x in <2:+oo)
(4*x-8)^(1/2) = 6 // - 6
(4*x-8)^(1/2)-6 = 0
(4*x-8)^(1/2) = -6 // + 6
(4*x-8)^(1/2) = 6 // ^ 2
abs(4*x-8) = 6^2 // - 6^2
abs(4*x-8)-6^2 = 0
x in (-oo:+oo)
abs(4*x-8)
4*x-8 >= 0
4*x-8 >= 0 // + 8
4*x >= 8 // : 4
x >= 8/4
x >= 2
x in <2:+oo)
4*x-6^2-8 = 0
x in (-oo:2)
8-(4*x)-6^2 = 0
abs(4*x-8)-6^2 = 0
/ | 8-(4*x)-6^2 = 0 i x in (-oo:2) | 4*x-6^2-8 = 0 i x in <2:+oo)
x in (-oo:2)
8-(4*x)-6^2 = 0
-4*x-28 = 0 // + 28
-4*x = 28 // : -4
x = 28/(-4)
x = -7
x in <2:+oo)
4*x-6^2-8 = 0
4*x-44 = 0 // + 44
4*x = 44 // : 4
x = 44/4
x = 11
x in { -7}
x = 11
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