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a in (-oo:+oo)
a/4-(a/3) = -1/2 // + -1/2
a/4-(a/3)-(-1/2) = 0
a/4-(a/3)+1/2 = 0
1/2-1/12*a = 0 // - 1/2
-1/12*a = -1/2 // : -1/12
a = -1/2/(-1/12)
a = 6
a = 6
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