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Rezolvati ecuatia : l -2,x+2l - 4=16

Răspuns :

[tex]1 - 2x + 21 - 4 = 16 \\ 1 - 2x + 21 = 16 + 4 \\ 1 - 2x = 20 \\ 2x = 20 - 1 \\ 2x = 19 \\ x = 19 \div 2 \\ = 8.5[/tex]