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1)Sa se rezolve inecuatia:

a) 2(5x+9)-7x≥27


Răspuns :

[tex]2(5x+9)-7x \geq 27 = 10x+18-7x \geq 27=3x+18 \geq 27[/tex][tex]=3x \geq 27-18=3x \geq 9=x \geq 3[/tex] 
succes .