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