Раскройте скобки и приведите подобные слагаемые:
1) 5 + (4а -4); 4) -(5c-d) + (4d + 5с);
2) 17х-(4х-5); 5) (n - m)- (-2m - 3n);
3) (76 - 4) - (46 + 2); 6) 7(-5х + у) - (-2у + 4х) + (х - 3у)
Плохо поняла тему
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