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Debemos despejar X.
Así que:
X+4=9
X=9-4
X=5
Espero entiendas, cualquier duda, me preguntas.
1x - 4 = 9
1x = 9 + 4
1x = 13 (divide both sides by 1 to get x)
1x/1 = 13/1
x = 13