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x in (-oo:+oo)
(4/9)*x = 5/8 // - 5/8
(4/9)*x-(5/8) = 0
(4/9)*x-5/8 = 0
4/9*x-5/8 = 0 // + 5/8
4/9*x = 5/8 // : 4/9
x = 5/8/4/9
x = 45/32
x = 45/32
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