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α is the one with the + sign.
Find the cube of it and rewrite the right hand side in terms of α
2a2  3a = 7
a (2a  3) = 7
a (2a  3) (2a + 3) = 7 (2a + 3)
a (4a2  9) = 14a + 21
4a3  9a = 14a + 21
4a3 = 23a + 21
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