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x in (-oo:+oo)
6.2 = x/2.8 // - x/2.8
6.2-(x/2.8) = 0
6.2-0.35714286*x = 0
6.2-0.35714286*x = 0 // - 6.2
-0.35714286*x = -6.2 // : -0.35714286
x = -6.2/(-0.35714286)
x = 17.35999986
x = 17.35999986
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