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