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b)  4x^{2} - (2x + 1) ^{2} < 3

c) (3-x) ^{2} \geq x^{2} + 12

d) (2x + 1)(2x-1) = 4 x^{2} - 9x

e) 2-(2x-1) ^{2} \leq (3-2x)(2x+3)

f) 4(x+2) ^{2} - (2x-1) ^{2} = -5
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