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x in (-oo:+oo)
(4*x)/9-4 = 7 // - 7
(4*x)/9-7-4 = 0
4/9*x-11 = 0 // + 11
4/9*x = 11 // : 4/9
x = 11/4/9
x = 99/4
x = 99/4
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