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