Помогите решить
упростите
а) 4-(-3-4в)
б)-5 (-2с+7а)
в)3 (-5а+3в)
г )-6 (4а+2в)
раскройте скобки
а)(-а-в)+(с+d)
б)-(-а-в)-(-с+d)
в)-(а+в)+(-с-d)
г)-(а+в)-(с-d)
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