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X in (-oo:+oo)
(7/9)*X-2 = 4 // - 4
(7/9)*X-4-2 = 0
7/9*X-6 = 0 // + 6
7/9*X = 6 // : 7/9
X = 6/7/9
X = 54/7
X = 54/7
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