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4x-6y=23
________
9x=43
x=43/9
5(43/9)+6y=20
215/9+6y=20
6y=20-(215/9)
6y=-35/9
y=-35/9
_____
6
y=-35/54
comprobacion
5x+6y=20
5(43/9)+6(-35/54)=20
215/9-35/9=20
180/9=20
20=20
x= 43/9
y=-35/54