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X in (-oo:+oo)
(X-3)/5 = -7 // + 7
(X-3)/5+7 = 0
(X-3)/5+(5*7)/5 = 0
X+5*7-3 = 0
X+32 = 0
(X+32)/5 = 0
(X+32)/5 = 0 // * 5
X+32 = 0
X+32 = 0 // - 32
X = -32
X = -32
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