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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 3 - No. 5)

Simplify: 15z - (8z + 4)
7z - 4
7z + 4
23z - 4
23z + 4

解释

15z - (8z+4) = 15z - 8z - 4 = 7z - 4

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