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x in (-oo:+oo)
(7/9)*x = 1/3 // - 1/3
(7/9)*x-(1/3) = 0
(7/9)*x-1/3 = 0
7/9*x-1/3 = 0 // + 1/3
7/9*x = 1/3 // : 7/9
x = 1/3/7/9
x = 3/7
x = 3/7
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