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x in (-oo:+oo)
12 = (1/2)*x-12 // - (1/2)*x-12
12-((1/2)*x)+12 = 0
(-1/2)*x+12+12 = 0
24-1/2*x = 0 // - 24
-1/2*x = -24 // : -1/2
x = -24/(-1/2)
x = 48
x = 48
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