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x in (-oo:+oo)
(7*x+2)/5 = -8 // + 8
(7*x+2)/5+8 = 0
(7*x+2)/5+(5*8)/5 = 0
7*x+5*8+2 = 0
7*x+42 = 0
(7*x+42)/5 = 0
(7*x+42)/5 = 0 // * 5
7*x+42 = 0
7*x+42 = 0 // - 42
7*x = -42 // : 7
x = -42/7
x = -6
x = -6
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