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2x^2 - 21x + c = 0
x^2 - 21x/2 + c/2 = 0
(x + a)(x + 2a)= x^2 - 21x/2 + c/2
x^2 + 3a + 2a^2
3a = -21/2 ------> a = -7/2
2a^2 = c/2 ---> 49/2 = c/2 ---> c = 49
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