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3x + 12 - 4x = 12 - x
- x + 12 = 12 - x
- x + x = 12 - 12
0 = 0
No existe solución.
x+4-4x=12-x
acomodamos terminos semejantes:
+4-12=4x-x-x
-8=2x
despejamos x
-8/2=x
-4=x
Por lo tanto "x" vale -4
COMPROBAMOS:
x+4-4x=12-x
-4+4-4(-4)=12-(-4)
16=12+4
16=16
Saludos cordiales, me alegra haberte ayudado!