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