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486:[148-(195-28:a)x4:8]=9

Răspuns :

486:[148-(195-28:a)×4:8]=9

148-(195-28:a)×4:8= 54

(195-28:a)×4:8= 94

(195-28:a)×4= 752

195-28:a= 188

28:a= 7

a= 28:7

a= 4