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x in (-oo:+oo)
x/2.8 = 4 // - 4
x/2.8-4 = 0
0.35714286*x-4 = 0 // + 4
0.35714286*x = 4 // : 0.35714286
x = 4/0.35714286
x = 11.19999991
x = 11.19999991
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