Respuestas

2013-11-08T07:12:07+01:00
ECUACION
-3x+8-(x+5)=4x+12
-3x+8-x-5=4x+12
-4x+8-5=4x+12
-4x-4x=-8+5+12
-8x=9
x=-9/8
COMPROBACION
-3(-9/8)+8-(-9/8+5)=4(9/8)+12
27/8+8+9/8-5=-36/8+12
36/8+8-5=60/8
36/8+3=60/8
60/8=60/8
2013-11-08T08:05:03+01:00
-3x+8-(x+5)=4x+12
-3x + 8 -x -5 = 4x + 12
-3x - x -4x = 12 - 8 + 5 
-8x = 9
x= -(9/8)