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(6*x^2-(48*x)+72)/2 = 0
(6*x^2-48*x+72)/2 = 0
6*x^2-48*x+72 = 0
6*(x^2-8*x+12) = 0
x^2-8*x+12 = 0
DELTA = (-8)^2-(1*4*12)
DELTA = 16
DELTA > 0
x = (16^(1/2)+8)/(1*2) or x = (8-16^(1/2))/(1*2)
x = 6 or x = 2
6*(x-2)*(x-6) = 0
(6*(x-2)*(x-6))/2 = 0
( x-2 )
x-2 = 0 // + 2
x = 2
( x-6 )
x-6 = 0 // + 6
x = 6
x in { 2, 6 }
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