(1-2y)(1-2y)-(2y-3)(2y+3)
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(1 – 2y)(1 – 2y) – (2y – 3)(2y + 3) = (1 – 2y)² – ((2y)² – 3²) = 1 – 4y + (2y)² – (2y)² + 3² = 1 – 4y + 9 = 10 – 4y = 2 × (5 – 2y)