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x in (-oo:+oo)
(x-7)/7 = -5 // + 5
(x-7)/7+5 = 0
(x-7)/7+(5*7)/7 = 0
x+5*7-7 = 0
x+28 = 0
(x+28)/7 = 0
(x+28)/7 = 0 // * 7
x+28 = 0
x+28 = 0 // - 28
x = -28
x = -28
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