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X in (-oo:+oo)
(X-4)/(-2) = -8 // + 8
(X-4)/(-2)+8 = 0
(X-4)/(-2)+(-2*8)/(-2) = 0
X-2*8-4 = 0
X-20 = 0
(X-20)/(-2) = 0
(X-20)/(-2) = 0 // * -2
X-20 = 0
X-20 = 0 // + 20
X = 20
X = 20
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