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2x-2y=10
y=5-3x
2x-2(5-3x)=10
2x-10+6x=10
2x+6x=10+10
8x=20
x=20/8
x=5/2
sustituyendo y en ec
3x+y=5
3(5/2)+y=5
15/2+y=5
y=5-15/2
y=-5/2
Saludos, espero haberte ayudado!