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(13supra5+7supra5)-(10supra5+2supra5)=f+5supra5

Răspuns :

(13/5 + 7/5) - (10/5 + 2/5) = f + 5/5
20/5 - 12/5 = f + 5/5
8/5 = f + 5/5
f = 8/5 - 5/5
f=3/5