6. Factorize the following expressions by regrouping only: a. 9(r - s) + p(s - r) + 3r -3s b. a'x + a(2x - y) - a (2ay + z) - 2z c. 5xy - y2 + 15zx - 3yz d. ab-bc-ab + e. (x + 2x) - 7(x + 2x) - y(x + 2x) + 7y
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6. Factorize the following expressions by regrouping only: a. 9(r - s) + p(s - r) + 3r -3s b. a'x + a(2x - y) - a (2ay + z) - 2z c. 5xy - y2 + 15zx - 3yz d. ab-bc-ab + e. (x + 2x) - 7(x + 2x) - y(x + 2x) + 7y
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