((259 - (45 + х)) - 18 = 125;

Question

((259 - (45 + х)) - 18 = 125;

Answer 1

(259 -(45+х))-18=125
259 -45-х-18=125
-х=125-259+45+18=-71   
х=-71/-1=71     
Ответ: х=71

Answer 2

(125+18+259)-45=347
1)125+18=133
2)133+259=392
3)392-45=347