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x in (-oo:+oo)
-0.8 = x/6-2.8 // - x/6-2.8
2.8-(x/6)-0.8 = 0
2-1/6*x = 0 // - 2
-1/6*x = -2 // : -1/6
x = -2/(-1/6)
x = 12
x = 12
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