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Factorise the following by taking out the common factor:
1. \(6xy - 4y^2 + 12xy - 2yzx =\)
2. \(a^3 - 3a^2 + a - 3 =\)
3. \(3y^3 - 48y =\)
4. \(ab^2 - bc^2 - ab + c^2 =\)
Answer variants:
\(2y(9x - 2y + zx)\)
\((a - 3)(a^2 - 1)\)
\((b - 1)(ab + c^2)\)
\(3(y + 4)(y - 4)\)
\(2y(9x - 2y - zx)\)
\((b - 1)(ab - c^2)\)
\((a - 3)(a^2 + 1)\)
\(3y(y + 4)(y - 4)\)
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