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D( x )
5*x-6 < 0
5*x-6 < 0
5*x-6 < 0
5*x-6 < 0 // + 6
5*x < 6 // : 5
x < 6/5
x in <6/5:+oo)
(5*x-6)^(1/2) = 7 // - 7
(5*x-6)^(1/2)-7 = 0
(5*x-6)^(1/2) = -7 // + 7
(5*x-6)^(1/2) = 7 // ^ 2
abs(5*x-6) = 7^2 // - 7^2
abs(5*x-6)-7^2 = 0
x in (-oo:+oo)
abs(5*x-6)
5*x-6 >= 0
5*x-6 >= 0 // + 6
5*x >= 6 // : 5
x >= 6/5
x in <6/5:+oo)
5*x-7^2-6 = 0
x in (-oo:6/5)
6-(5*x)-7^2 = 0
abs(5*x-6)-7^2 = 0
/ | 6-(5*x)-7^2 = 0 i x in (-oo:6/5) | 5*x-7^2-6 = 0 i x in <6/5:+oo)
x in (-oo:6/5)
6-(5*x)-7^2 = 0
-5*x-43 = 0 // + 43
-5*x = 43 // : -5
x = 43/(-5)
x = -43/5
x in <6/5:+oo)
5*x-7^2-6 = 0
5*x-55 = 0 // + 55
5*x = 55 // : 5
x = 55/5
x = 11
x in { -43/5}
x = 11
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