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2014-06-29T17:14:34+03:00
A-b=600
a=600+b

a/4-50=1/3 * b

a/4-50=b/3   aducem la acelasi numitor

3a-600=4b

3(600+b)-600=4b
1800+3b-600=4b

4b-3b=1200
b=1200

a=600+1200
a=1800
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