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X in (-oo:+oo)
(X-4)/4 = 0.3 // - 0.3
(X-4)/4-0.3 = 0
(X-4)/4+(-0.3*4)/4 = 0
X-0.3*4-4 = 0
X-5.2 = 0
(X-5.2)/4 = 0
(X-5.2)/4 = 0 // * 4
X-5.2 = 0
X-5.2 = 0 // + 5.2
X = 5.2
X = 5.2
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