az² - bz² - bz + az - a + b = (az² - bz²) - (bz - az) - (a - b) =
= z²(a - b) - z(b - a) - (a - b) = z²(a - b) + z(a - b) - (a - b) =
= (a - b)(z² + z - 1)
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az² - bz² - bz + az - a + b = (az² - bz²) - (bz - az) - (a - b) =
= z²(a - b) - z(b - a) - (a - b) = z²(a - b) + z(a - b) - (a - b) =
= (a - b)(z² + z - 1)