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X in (-oo:+oo)
200/10 = X/2.8 // - X/2.8
200/10-(X/2.8) = 0
200/10-0.35714286*X = 0
20-0.35714286*X = 0 // - 20
-0.35714286*X = -20 // : -0.35714286
X = -20/(-0.35714286)
X = 55.99999955
X = 55.99999955
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