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X in (-oo:+oo)
X/2.8-4.9 = -2.748 // + 2.748
X/2.8-4.9+2.748 = 0
0.35714286*X-2.152 = 0 // + 2.152
0.35714286*X = 2.152 // : 0.35714286
X = 2.152/0.35714286
X = 6.02559995
X = 6.02559995
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