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x in (-oo:+oo)
(6/9)*x = 8/5 // - 8/5
(6/9)*x-(8/5) = 0
(6/9)*x-8/5 = 0
2/3*x-8/5 = 0 // + 8/5
2/3*x = 8/5 // : 2/3
x = 8/5/2/3
x = 12/5
x = 12/5
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