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x in (-oo:+oo)
X/2+x/3+x/6 = 0
1/2*X+1/2*x = 0 // - 1/2*X
1/2*x = -(1/2*X) // : 1/2
x = (-(1/2*X))/1/2
x = -X
x = -X
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