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X in (-oo:+oo)
(X-5)/4 = -12/3 // + -12/3
(X-5)/4-(-12/3) = 0
(X-5)/4+4 = 0
(X-5)/4+(4^2)/4 = 0
X-5+16 = 0
X+11 = 0
(X+11)/4 = 0
(X+11)/4 = 0 // * 4
X+11 = 0
X+11 = 0 // - 11
X = -11
X = -11
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