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x in (-oo:+oo)
8/10-(6*x) = 0.4 // - 0.4
8/10-(6*x)-0.4 = 0
8/10-6*x-0.4 = 0
0.4-6*x = 0 // - 0.4
-6*x = -0.4 // : -6
x = -0.4/(-6)
x = 0.06666667
x = 0.06666667
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