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a in (-oo:+oo)
27 = a/0.8 // - a/0.8
27-(a/0.8) = 0
27-1.25*a = 0
27-1.25*a = 0 // - 27
-1.25*a = -27 // : -1.25
a = -27/(-1.25)
a = 21.6
a = 21.6
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