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franela y
4x + 5y=1275 x=1275-5y/4
5x + 4y=1290 x=1290-4y/5
1290-4y(4)=1275-5y(5)
5160-16y=6375-25y
9y= 1215
y= 135
x=1290-4(135)/5
x=150