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1)Aflati a din:
(12+a)+14=4xa-4=?


Răspuns :

[tex]\displaystyle (12+a)+14=4a-4 \\ 12+a+14=4a-4 \\ a-4a=-4-12-14 \\ -3a=-30 \\ a= \frac{-30}{-3} \\ a=10[/tex]