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x in (-oo:+oo)
-0.8*(x/6) = 4 // - 4
-0.8*(x/6)-4 = 0
-0.133333336*x-4 = 0 // + 4
-0.133333336*x = 4 // : -0.133333336
x = 4/(-0.133333336)
x = -29.9999994
x = -29.9999994
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