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-3y= -25-8x
2) x-5y=-17
-5y=-17-x
x-5y=-17
2º -25+3y/8-5y=-17 3º 8x-3·3=-25
-25+3y-40y=-136 8x-9=-25
3y-40y=-136+25 8x=-25+9
-37y=-111 8x=-16
y=-111/-37 x=-16/8
y=3 x=-2
eso es todo