Помогите пожалуйста 6 класс

7. Определите истинные выражения. Исправьте ошибки в ложных выражениях:
a) – 6 ∙ (4 + 12) = –24 – 72;
в) (m – n) ∙ (–2) = –2m – 2n;
д) –(2 + c) = –2 + c;
б) (–6 – 9) ∙ 7= –42 +63;
г) –5 ∙ (p – k + 9) = –5p+5k –45;
e) –(–a – b) = a – b.
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