Sum
Factorise : ax + 2bx + 3cx - 3a - 6b - 9c
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Solution
ax + 2bx + 3cx - 3a - 6b - 9c
= x (a + 2b + 3c) - 3 (a + 2b + 3c)
= (a + 2b + 3c) (x - 3)
Concept: Factorisation by Grouping
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