Rezolvati in multimea numerelor rationale ecuatiile: 3x-15=6
2supra5x +1=3,5
4(x+3)=2x-17
3(x+5)=10x-11
21(x+2)=6x-7.


Răspuns :

3x=15
[tex]3x = 15 + 6 x = 21 \div 3 = 7[/tex]