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x in (-oo:+oo)
(7/9)*x = 1/2 // - 1/2
(7/9)*x-(1/2) = 0
(7/9)*x-1/2 = 0
7/9*x-1/2 = 0 // + 1/2
7/9*x = 1/2 // : 7/9
x = 1/2/7/9
x = 9/14
x = 9/14
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