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x in (-oo:+oo)
(1/3)*x = x-12-4 // - x-12-4
(1/3)*x-x+4+12 = 0
16-2/3*x = 0 // - 16
-2/3*x = -16 // : -2/3
x = -16/(-2/3)
x = 24
x = 24
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