Даю 15 баллов :)

Решите уравнения:

x^2 − 9x + 20 = 0
21x^2 − 2x − 3 = 0
( 3x + 1 ) ( 9x^2 − 3x + 1 ) − ( 9x^2 + 2 )( 3x − 2 ) = 16x^2 + 1

Заранее спасибо :)
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