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X in (-oo:+oo)
X/7 = 45/9 // - 45/9
X/7-(45/9) = 0
X/7-5 = 0
1/7*X-5 = 0 // + 5
1/7*X = 5 // : 1/7
X = 5/1/7
X = 35
X = 35
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