СРОЧНО!
Решите уравнения:

1) ( (х - 2108) - 517 ) + 818 = 818

2) 2001 - ( 197 - (х + 51) ) = 2001

3) 755 + ( 813- (619+х) ) = 755

4) 1431 - ( (259 - х) - 101 ) = 1431

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