Помогите пожалуйста 6 класс

6. Раскройте скобки:
a) –2 ∙ (4 + 5m – 7n);
в) –2 ∙ (–14t + z – 25c);
б) 9 ∙ (–18x + 5y –78);
г) (–23) ∙ (k + 65p – 12x).
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