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___ : ___
y2-y1 x2-x1
y-4 : x-1
___ ___
4-3 0-1
-1(y-4) : 1(x-1)
-1y+4 : 1x-1
-1y : 1x-1-4
1x-1y-5 ATAU
x-y-5
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