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(275-2x30):5+(3xa-5):4=53

Răspuns :

Răspuns:

(275-60):5+(3a-5):4=53

215:5+(3@-5):4

43+(3@-5):4=53 |-43

(3@-5):4=10 |× 4

3a-5=40 |+5

3a=45 |:3

A = 15