Respuestas

2013-06-04T19:02:46+02:00
5 . X + 4 . X = 21 - X
5X + 4X + X = 21
10X = 21
X = 21 / 10
  • Usuario de Brainly
2013-06-04T19:08:47+02:00
5.X+4.X= 21-X
5x+4x= 21-x
9x+x= 21
10x= 21
x= 21/10
x= 2.1

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