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x in (-oo:+oo)
(4/9)*x = 28/7 // - 28/7
(4/9)*x-(28/7) = 0
(4/9)*x-4 = 0
4/9*x-4 = 0 // + 4
4/9*x = 4 // : 4/9
x = 4/4/9
x = 9
x = 9
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