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x in (-oo:+oo)
220 = 1/2-(12*x) // - 1/2-(12*x)
12*x-(1/2)+220 = 0
12*x-1/2+220 = 0
12*x+439/2 = 0 // - 439/2
12*x = -439/2 // : 12
x = -439/2/12
x = -439/24
x = -439/24
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