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x in (-oo:+oo)
(x-3)/7 = 5/14 // - 5/14
(x-3)/7-(5/14) = 0
(x-3)/7-5/14 = 0
(14*(x-3))/(7*14)+(-5*7)/(7*14) = 0
14*(x-3)-5*7 = 0
14*x-77 = 0
(14*x-77)/(7*14) = 0
(14*x-77)/(7*14) = 0 // * 7*14
14*x-77 = 0
14*x-77 = 0 // + 77
14*x = 77 // : 14
x = 77/14
x = 11/2
x = 11/2
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