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x in (-oo:+oo)
-2.8 = x/(-3) // - x/(-3)
-(x/(-3))-2.8 = 0
1/3*x-2.8 = 0 // + 2.8
1/3*x = 2.8 // : 1/3
x = 2.8/1/3
x = 8.40000008
x = 8.40000008
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