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-2x=-y-15
x-6y=13/*2
-2x+y= -15
2x-12y= 26
-2x+y= -15
-----------------
-12y+y=26-15
-11y=11/:(-11)
y= -1
x-6y=13
x-6*(-1)=13
x+6=13
x=13-6
x=7
x=7
y= -1