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a in (-oo:+oo)
16 = a/0.2 // - a/0.2
16-(a/0.2) = 0
16-5*a = 0
16-5*a = 0 // - 16
-5*a = -16 // : -5
a = -16/(-5)
a = 16/5
a = 16/5
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