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x in (-oo:+oo)
(4*x)/7-3 = 8 // - 8
(4*x)/7-8-3 = 0
4/7*x-11 = 0 // + 11
4/7*x = 11 // : 4/7
x = 11/4/7
x = 77/4
x = 77/4
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