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D( x )
3*x-8 = 0
3*x-8 = 0
3*x-8 = 0
3*x-8 = 0 // + 8
3*x = 8 // : 3
x = 8/3
x in (-oo:8/3) U (8/3:+oo)
40/(3*x-8) = 10 // - 10
40/(3*x-8)-10 = 0
40/(3*x-8)+(-10*(3*x-8))/(3*x-8) = 0
40-10*(3*x-8) = 0
120-30*x = 0
(120-30*x)/(3*x-8) = 0
(120-30*x)/(3*x-8) = 0 // * 3*x-8
120-30*x = 0
120-30*x = 0 // - 120
-30*x = -120 // : -30
x = -120/(-30)
x = 4
x = 4
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