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X in (-oo:+oo)
X/5 = 42/50 // - 42/50
X/5-(42/50) = 0
X/5-21/25 = 0
1/5*X-21/25 = 0 // + 21/25
1/5*X = 21/25 // : 1/5
X = 21/25/1/5
X = 21/5
X = 21/5
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