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(525 : 5 + b) : 5 + 12 = 790
(65 * 502 : 10 - c - 630) : 3 = 600
[ ( e : 8 + 5609) : 2 - 111] : 10 = 400
( 540 : 6 * 9 - 755) : ( g - 386) = 5



Răspuns :

(525:5+b):5+12=790.....15+b:5+12=790......15+b:5+12=790-12=778.....15+b:5=778-15=763.......b:5=763.....b=763*5......b=3815