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X in (-oo:+oo)
X/16 = 3.5 // - 3.5
X/16-3.5 = 0
1/16*X-3.5 = 0 // + 3.5
1/16*X = 3.5 // : 1/16
X = 3.5/1/16
X = 56
X = 56
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