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X in (-oo:+oo)
2*X-(1/9) = 7 // - 7
2*X-(1/9)-7 = 0
2*X-1/9-7 = 0
2*X-64/9 = 0 // + 64/9
2*X = 64/9 // : 2
X = 64/9/2
X = 32/9
X = 32/9
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