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(x) (x-2) - 24 = 0
x^2'-2x - 24 = 0
x ............. +4
x ............. -6
-6x+4x = -2x
(x+4)(x-6) = 0
x + 4 = 0
x = -4
x - 6 =:0
x = 6
CS = ( -4; 6 )