If p(x) = x3 - ax2 + 2x + a - 1 and p(a) = 0, then find the value of a.
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P(a) = (a³)-a(a)²+2a+a-1
0 = a³-a³+3a-1
3a-1 = 0
3a = 1
a = 1/3
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