Respuestas

2012-04-21T21:47:27+02:00

6a+3b=3

-12a+9b=39

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12(6a+3b=3)

6(-12a+9b=39)

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72a+36b=36

-72a+54b=234

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90b=270

 

b=270/90

b=3

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6a+3(3)=3

a=3-9/6

a=1