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4x^2
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(2x - 3)(2x + 3)(2x-3)(2x+3)
Assuming that 4x2+2x = 0: 2x (2x+1) = 0 2x = 0 or 2x+1 = 0 x = 0 or -1/2
x=1
2x - y -(-1) = 2x - y + 1