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A+b supra 2 egal cu b+14 supra 7 aflati a supra b

Răspuns :

(a+b)/2=(b+14)/7
7*(a+b)=2*(b+14)
7a+7b=2b+28
7a+5b=28
7a=28-5b
a=(28-5b)/7
a/b=
(28-5b)/7b=28/7b-5/7=4/b-5/7