. Раскройте скобки и приведите подобные слагаемые:
1) 7(2a-3b)-9(56–8a)-63a-45b; 3) 36 (-2x-3y-5)+66x–72y-80;
2) 23m-69n-3(9m-7n)+бm-7n; 4) 99p-6(5p-3q)+9(15р-84-66р
пж помогите ​
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