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X in (-oo:+oo)
X/20 = 7/20 // - 7/20
X/20-(7/20) = 0
X/20-7/20 = 0
1/20*X-7/20 = 0 // + 7/20
1/20*X = 7/20 // : 1/20
X = 7/20/1/20
X = 7
X = 7
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