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a in (-oo:+oo)
9 = (-1/3)*a // - (-1/3)*a
9-((-1/3)*a) = 0
(1/3)*a+9 = 0
1/3*a+9 = 0 // - 9
1/3*a = -9 // : 1/3
a = -9/1/3
a = -27
a = -27
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