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X in (-oo:+oo)
X/3 = 39.9 // - 39.9
X/3-39.9 = 0
1/3*X-39.9 = 0 // + 39.9
1/3*X = 39.9 // : 1/3
X = 39.9/1/3
X = 119.7000012
X = 119.7000012
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