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x in (-oo:+oo)
(8/9)*x = 4/10 // - 4/10
(8/9)*x-(4/10) = 0
(8/9)*x-2/5 = 0
8/9*x-2/5 = 0 // + 2/5
8/9*x = 2/5 // : 8/9
x = 2/5/8/9
x = 9/20
x = 9/20
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