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a in (-oo:+oo)
6 = (1/3)*a // - (1/3)*a
6-((1/3)*a) = 0
(-1/3)*a+6 = 0
6-1/3*a = 0 // - 6
-1/3*a = -6 // : -1/3
a = -6/(-1/3)
a = 18
a = 18
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