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X in (-oo:+oo)
(X/1)/2 = 50 // - 50
(X/1)/2-50 = 0
X/2-50 = 0
1/2*X-50 = 0 // + 50
1/2*X = 50 // : 1/2
X = 50/1/2
X = 100
X = 100
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