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X in (-oo:+oo)
X/20 = 2/10 // - 2/10
X/20-(2/10) = 0
X/20-1/5 = 0
1/20*X-1/5 = 0 // + 1/5
1/20*X = 1/5 // : 1/20
X = 1/5/1/20
X = 4
X = 4
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