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(253+n)-204+(312-194)=181

Răspuns :

(253+n)-204+(312-194)=181

(253+n)-204+118=181

(253+n)-204=181-118

(253+n)-204=63

253+n=63+204

253+n=267=>n=267-253=14

Explicație pas cu pas:

(253+n)-204+(312-194)=181

(253+n)-204+118=181

253+n=181+86

253+n=267/-253

n=14