1) Factorize: 7x - 42.
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Answer:
7x-42
7x=7xx
42 = 2 × 3 ×
7 is the only common factor.
7x-42=(7xx) - (2 × 3 × 7)
= 7 (x - (2 x 3))
= 7(x - 6)
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