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x in (-oo:+oo)
(1/2)*x-23 = 12*x // - 12*x
(1/2)*x-(12*x)-23 = 0
(1/2)*x-12*x-23 = 0
-23/2*x-23 = 0 // + 23
-23/2*x = 23 // : -23/2
x = 23/(-23/2)
x = -2
x = -2
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