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x in (-oo:+oo)
(4/9)*x = 5/5 // - 5/5
(4/9)*x-(5/5) = 0
(4/9)*x-1 = 0
4/9*x-1 = 0 // + 1
4/9*x = 1 // : 4/9
x = 1/4/9
x = 9/4
x = 9/4
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