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2014-04-19T17:09:28+03:00
A*b=36    a=36/b
(a+7)*b=99
(36/b+7)*b=99  aducem la acelasi numitor in paranteza
36+7b/b*b=99
36+7b=99
7b=99-36
7b=63
b=9
a=36/9=4
9 3 9