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X in (-oo:+oo)
X/20 = 0.9 // - 0.9
X/20-0.9 = 0
1/20*X-0.9 = 0 // + 0.9
1/20*X = 0.9 // : 1/20
X = 0.9/1/20
X = 18
X = 18
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