Respuesta:
x + 3y = 7
3y = 7 -x
[tex]y = \frac{7 - x}{3} [/tex]
paso#2
4(7-x)
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Respuesta:
x + 3y = 7
3y = 7 -x
[tex]y = \frac{7 - x}{3} [/tex]
paso#2
4(7-x)