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By substituting x = -1/3 in the equation, we should get zero
Upon substituting, 27(-1/3)^3 - a(-1/3)^2 - (-1/3) + 3 = 0
27(-1/27) - a(1/9) + (1/3) + 3 =0
-1 -a/9 +10/3 = 0
a/9 = 7/3
a = 63/3
a = 21
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