1-2:x=-11 y=19 1-3:x=-9/4 y=-1/4 2-3:x=1 y=-3 2-4:x=25 y=2 3-2:x=-2 y=-1 3-7은없네요3-4가아닐까해서3-4알려드려요^^:x=-4 y=1 4-1:x=2 y=2
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