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X in (-oo:+oo)
X/(-12) = -0.4 // + 0.4
X/(-12)+0.4 = 0
0.4-1/12*X = 0 // - 0.4
-1/12*X = -0.4 // : -1/12
X = -0.4/(-1/12)
X = 4.80000019
X = 4.80000019
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