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A in (-oo:+oo)
A/28 = 4/1.4 // - 4/1.4
A/28-(4/1.4) = 0
A/28-2.85714286 = 0
1/28*A-2.85714286 = 0 // + 2.85714286
1/28*A = 2.85714286 // : 1/28
A = 2.85714286/1/28
A = 79.99999048
A = 79.99999048
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