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rezolvati ecuatia: 7x + 3(2x-1) = 10x + 9

Răspuns :

7x+6x-3=10x+9
13x-10x=9+3
3x=12
x=12:3
x=4
7x+3(2x-1)=10x+9;;; 7x+6x-3=10x+9;;; 13x-10x=9+3;;; 3x=12;;; x=12÷3;;; x=4 .