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x in (-oo:+oo)
(5/2)*x = 7/9 // - 7/9
(5/2)*x-(7/9) = 0
(5/2)*x-7/9 = 0
5/2*x-7/9 = 0 // + 7/9
5/2*x = 7/9 // : 5/2
x = 7/9/5/2
x = 14/45
x = 14/45
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