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X in (-oo:+oo)
X/20 = 21/35 // - 21/35
X/20-(21/35) = 0
X/20-3/5 = 0
1/20*X-3/5 = 0 // + 3/5
1/20*X = 3/5 // : 1/20
X = 3/5/1/20
X = 12
X = 12
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