6x+5y=7x+3y+1=2(x+6y-1)
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6x-7x+5y-3y=1=2x+12y-2
-x+2y=1=2x+12y-2
-1-x+2y=2x+12y-2
-x-2x+2y-12y=-2+1
-3x-10y=-1
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