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X in (-oo:+oo)
X/5 = 12/3 // - 12/3
X/5-(12/3) = 0
X/5-4 = 0
1/5*X-4 = 0 // + 4
1/5*X = 4 // : 1/5
X = 4/1/5
X = 20
X = 20
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