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(5x10+10x5+9:3)-63=5xa

Răspuns :

(50+50+3)-63=5xa
(100+3)-63=5xa
103-63=5xa
40=5xa
5xa=40
a=40:5
a=8
(50+50+3)-63=5a
103-63=5a
5a=40
a=40:5
a=8