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X in (-oo:+oo)
(X-7)/4 = -2 // + 2
(X-7)/4+2 = 0
(X-7)/4+(2*4)/4 = 0
X+2*4-7 = 0
X+1 = 0
(X+1)/4 = 0
(X+1)/4 = 0 // * 4
X+1 = 0
X+1 = 0 // - 1
X = -1
X = -1
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