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X in (-oo:+oo)
X/2 = 16.5 // - 16.5
X/2-16.5 = 0
1/2*X-16.5 = 0 // + 16.5
1/2*X = 16.5 // : 1/2
X = 16.5/1/2
X = 33
X = 33
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