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x in (-oo:+oo)
22 = (1/2)*x-(12*x) // - (1/2)*x-(12*x)
12*x-((1/2)*x)+22 = 0
(-1/2)*x+12*x+22 = 0
23/2*x+22 = 0 // - 22
23/2*x = -22 // : 23/2
x = -22/23/2
x = -44/23
x = -44/23
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