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a in (-oo:+oo)
4*a = 16/5 // - 16/5
4*a-(16/5) = 0
4*a-16/5 = 0
4*a-16/5 = 0 // + 16/5
4*a = 16/5 // : 4
a = 16/5/4
a = 4/5
a = 4/5
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