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x in (-oo:+oo)
(2/5)*x = 7/9 // - 7/9
(2/5)*x-(7/9) = 0
(2/5)*x-7/9 = 0
2/5*x-7/9 = 0 // + 7/9
2/5*x = 7/9 // : 2/5
x = 7/9/2/5
x = 35/18
x = 35/18
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