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7a-42=2a-6 varog ajutatima


Răspuns :

[tex]7a-42=2a-6 \\ 7a-2a=42-6 \\ 5a=36 \\ a=7,2[/tex]
[tex]\displaystyle 7a-42=2a-6 \\ 7a-2a=-6+42 \\ 5a=36 \\ a= \frac{36}{5} \\ a=7,2[/tex]