Всем привет! Помогите, пожалуйста.

По образцу упростите выражения.
а)48-(17+а)=48-17-а=31-а;
б)a-34-22=а-(34+22)=а-56;
в)116-(16+х)=?
г)387-(98+а)=?
д)a-486-114=?
е)b-77-123=?
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