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a in (-oo:+oo)
a/5-(4/5) = 12 // - 12
a/5-(4/5)-12 = 0
a/5-4/5-12 = 0
1/5*a-64/5 = 0 // + 64/5
1/5*a = 64/5 // : 1/5
a = 64/5/1/5
a = 64
a = 64
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