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a in (-oo:+oo)
a/4-(a/3) = -3/2 // + -3/2
a/4-(a/3)-(-3/2) = 0
a/4-(a/3)+3/2 = 0
3/2-1/12*a = 0 // - 3/2
-1/12*a = -3/2 // : -1/12
a = -3/2/(-1/12)
a = 18
a = 18
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