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X in (-oo:+oo)
X/10 = 4/4 // - 4/4
X/10-(4/4) = 0
X/10-1 = 0
1/10*X-1 = 0 // + 1
1/10*X = 1 // : 1/10
X = 1/1/10
X = 10
X = 10
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