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X in (-oo:+oo)
(X+2)/6 = 0.4 // - 0.4
(X+2)/6-0.4 = 0
(X+2)/6+(-0.4*6)/6 = 0
X-0.4*6+2 = 0
X-0.4 = 0
(X-0.4)/6 = 0
(X-0.4)/6 = 0 // * 6
X-0.4 = 0
X-0.4 = 0 // + 0.4
X = 0.4
X = 0.4
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