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a in (-oo:+oo)
12 = (3/2)*a // - (3/2)*a
12-((3/2)*a) = 0
(-3/2)*a+12 = 0
12-3/2*a = 0 // - 12
-3/2*a = -12 // : -3/2
a = -12/(-3/2)
a = 8
a = 8
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