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x in (-oo:+oo)
(4/7)*x-5 = 9 // - 9
(4/7)*x-9-5 = 0
4/7*x-14 = 0 // + 14
4/7*x = 14 // : 4/7
x = 14/4/7
x = 49/2
x = 49/2
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