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X in (-oo:+oo)
(X-40)/4+50 = 0
(X-40)/4+(4*50)/4 = 0
X+4*50-40 = 0
X+160 = 0
(X+160)/4 = 0
(X+160)/4 = 0 // * 4
X+160 = 0
X+160 = 0 // - 160
X = -160
X = -160
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