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(x³ - y²)z⁵ - (x³ - y²)z³ + 7(x³ - y²) = (x³ - y²)(z⁵ - z³ + 7)
f)
(2x²y + 1)z + (2x²y + 1)z² - 4(2x²y + 1)z⁴ = (2x²y + 1)(z + z² + z⁴) = z(2x²y + 1)(1 + z - 4z³)