6a(2b - 3a) + 2(3a - b)² = 12ab - 18a² + 2(9a² - 6ab + b²) =
= 12ab - 18a² + 18a² - 12ab + 2b² = 2b²
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6a(2b - 3a) + 2(3a - b)² = 12ab - 18a² + 2(9a² - 6ab + b²) =
= 12ab - 18a² + 18a² - 12ab + 2b² = 2b²