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x in (-oo:+oo)
200 = (1/2)*x-(12*x) // - (1/2)*x-(12*x)
12*x-((1/2)*x)+200 = 0
(-1/2)*x+12*x+200 = 0
23/2*x+200 = 0 // - 200
23/2*x = -200 // : 23/2
x = -200/23/2
x = -400/23
x = -400/23
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