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x in (-oo:+oo)
(2/9)*x = 7/5 // - 7/5
(2/9)*x-(7/5) = 0
(2/9)*x-7/5 = 0
2/9*x-7/5 = 0 // + 7/5
2/9*x = 7/5 // : 2/9
x = 7/5/2/9
x = 63/10
x = 63/10
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