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x in (-oo:+oo)
(7/9)*x = 1/6 // - 1/6
(7/9)*x-(1/6) = 0
(7/9)*x-1/6 = 0
7/9*x-1/6 = 0 // + 1/6
7/9*x = 1/6 // : 7/9
x = 1/6/7/9
x = 3/14
x = 3/14
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