на время. (×-96)-48=21. 879-(458+×)=231. (×-35)+26=47. 549-(425-×)=488 ​

1 ) 879 - ( 458 + х ) = 231

458 + х = 879 - 231;

458 + х = 648;

х = 648 - 458;

х = 190.

2 ) 951 - ( х - 354 ) = 882;

х - 354 = 951 - 882;

х - 354 = 69;

х = 69 + 354;

х = 423.

3 ) 549 - ( 425 - х ) = 488;

549 - 425 + х = 488;

124 + х = 488;

х = 488 - 124;

х = 364.