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(c-17)×3+15=45 va rog repede ...

Răspuns :

(c - 17) × 3 + 15 = 45
(c - 17) × 3 = 45 - 15
(c - 17) × 3 = 30
c - 17 = 30 : 3
c - 17 = 10
c = 10 + 17
c = 27