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x in (-oo:+oo)
28/9 = x/1.8 // - x/1.8
28/9-(x/1.8) = 0
28/9-0.55555556*x = 0
28/9-0.55555556*x = 0 // - 28/9
-0.55555556*x = -28/9 // : -0.55555556
x = -28/9/(-0.55555556)
x = 5.59999995
x = 5.59999995
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