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since it is divisible by 2x-1
=> x = 1/2
=>2(1/2)³ + a(1/2)² +11(1/2) + a + 3 = 0
=> 1/4 + a/4 + 11/2 + a + 3 = 0
=> 1+a+22+4a+12 = 0
=> 35 + 5a = 0
=> a = -7
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hopefully it will....
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