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Question is

Simplify combining like terms:

(i) 21b − 32 + 7b − 20b

(ii) − z2 + 13z2 − 5z + 7z3 − 15z

(iii) p − (p − q) − q − (− p)

(iv) 3a − 2b − ab − (a − b + ab) + 3ab + b − a

(v) 5x2y − 5x2 + 3y x2 − 3y2 + x− y+ 8xy2 −3y2

(vi) (3 y+ 5y − 4) − (8y − y2 − 4)

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