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Adelina1999
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Rezolvati ecuatia [3 (2x-7)+11]:2-9=1...... Multumesc

Răspuns :

 [3 (2x-7)+11]:2-9=1
[3 (2x-7)+11]:2=10
3 (2x-7)+11=20    
3 (2x-7)=9
6x-21=9
6x=30
x=30:6
x=5
[3 (2x-7)+11]:2-9=1 
(6x-21+11):2-9=1\+9
(6x-21+11):2=10\x2
6x-21+11=20\-11
6x-21=9\+21
6x=30
x=5

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