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X in (-oo:+oo)
X/4 = 9.9 // - 9.9
X/4-9.9 = 0
1/4*X-9.9 = 0 // + 9.9
1/4*X = 9.9 // : 1/4
X = 9.9/1/4
X = 39.6
X = 39.6
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