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