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reemplazando x:
-3(1-2y/5)+3y=5
Y=4/3
reemplazando y:
x=-1/3
2y=1-5x
y=1-5x sobre 2
1)susttuimos
-3x+3y=5
-3x+3(1-5xsobre2)=5
-3x+3sobre 2-15xsobre2=5
-6x+3-15xsobre2=5
3-21xsobre2=5
3-21x=10
-21x=10-3
x=7sobre21
x=1/3
2)Reemplazamos
5(1/3)+2y=1
5/3+2y=1
2y=1-5/3
2y=-2/3
y=-3