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a in (-oo:+oo)
16/64 = a/12 // - a/12
16/64-(a/12) = 0
1/4-1/12*a = 0 // - 1/4
-1/12*a = -1/4 // : -1/12
a = -1/4/(-1/12)
a = 3
a = 3
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