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x in (-oo:+oo)
(5*x-1)/7 = -2 // + 2
(5*x-1)/7+2 = 0
(5*x-1)/7+(2*7)/7 = 0
5*x+2*7-1 = 0
5*x+13 = 0
(5*x+13)/7 = 0
(5*x+13)/7 = 0 // * 7
5*x+13 = 0
5*x+13 = 0 // - 13
5*x = -13 // : 5
x = -13/5
x = -13/5
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