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a in (-oo:+oo)
a/12 = 4/5 // - 4/5
a/12-(4/5) = 0
a/12-4/5 = 0
1/12*a-4/5 = 0 // + 4/5
1/12*a = 4/5 // : 1/12
a = 4/5/1/12
a = 48/5
a = 48/5
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