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