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X in (-oo:+oo)
X/7 = 4.5 // - 4.5
X/7-4.5 = 0
1/7*X-4.5 = 0 // + 4.5
1/7*X = 4.5 // : 1/7
X = 4.5/1/7
X = 31.50000063
X = 31.50000063
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