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X in (-oo:+oo)
X/3-7 = 7.5 // - 7.5
X/3-7.5-7 = 0
1/3*X-14.5 = 0 // + 14.5
1/3*X = 14.5 // : 1/3
X = 14.5/1/3
X = 43.50000044
X = 43.50000044
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