Respuestas

2012-10-14T22:56:19+02:00

3x=5x-15

3x-5x=-15

-2x=-15

x=-15/-2 = 15/2

 

verifico

3.(15/2)=5.(15/2) -15

45/2=75/2 -15

45/2=45/2

 

7(x-4)=14

7x-28=14

7x=14+28

x=42/7

x=6

 

verifico

7 (6-4)=14

7 . 2 =14

 

9x(x-6)=0

9x=-x+6

9x+x=6

10x=6

x=6/10=3/5

 

verifico

 

9 (3/5)= -3/5+6

27/5=27/5