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a in (-oo:+oo)
(a+3.4)/2.5 = -5.92 // + 5.92
(a+3.4)/2.5+5.92 = 0
(a+3.4)/2.5+(2.5*5.92)/2.5 = 0
a+2.5*5.92+3.4 = 0
a+18.2 = 0
(a+18.2)/2.5 = 0
(a+18.2)/2.5 = 0 // * 2.5
a+18.2 = 0
a+18.2 = 0 // - 18.2
a = -18.2
a = -18.2
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