Make $$\(a\)$$ the subject of the formula $$\(M=a c-b d\)$$ (2) (b) Solve the inequality $$\(5 x-4< 39\)$$ (2) (c) Factorise fully $$\(18 e^{2} f^{3}-12 e^{3} f\)$$ (2)

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