Respuestas

2013-02-08T01:14:56+01:00

a) 2x+7= 9(3)

2x+7= 27

2x= 27-7

2x= 20

x= 20/2

x= 10

 

 

b) x-5/3= 2x-6/2

x-5= 2x-6/2 (3)

x-5= 6x-18/2

x= 3x-9+5

x-3x=-9+5

-2x=-4

x= -4/-2

x= 2

 

c) x-1/2= x-2/3+x-3/4

(x-1)/(2)= (4x-8)/(12)+(3x-9)/(12)

(x-1)/(2)= (12x-17)/(12)

x-1= (12x-17)(2)/12

x-1= (24x-34)/(12)

x-1= 2x-34/12

x-2x= -34/12+1

-x= -22/12

-x= -11/6

x= 11/6