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x in (-oo:+oo)
s = (1/2)*g+2 // - (1/2)*g+2
s-((1/2)*g)-2 = 0
(-1/2)*g+s-2 = 0
s-1/2*g-2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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