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x in (-oo:+oo)
(5*x)/7+4 = 7 // - 7
(5*x)/7-7+4 = 0
5/7*x-3 = 0 // + 3
5/7*x = 3 // : 5/7
x = 3/5/7
x = 21/5
x = 21/5
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