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Verified answer
Camisa= XPantalón 2X
Sustitución
2(2X)+3(x)=900
4x+3x=900
7x=900
X=128.571429
Resultado
Una Camisa cuesta 128.571429
Un pantalón cuesta 128.571429 x 2= 257.142857
Comprobación
128.571429 (3) + 257.142857 (2)=
385.714287+514.285714=900