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y-1/7-1=x-2/-2-2
y-1/6=x-2/-4
-4y+4=6x-12
6x+4y-16=0
------. = -------
y²-y¹. x²-x¹
y-1. x-2
----. = -------
7-1. -2-2
y-1. x-2
-----. =. ------ = -4y+4-6x+12 = -4y-6x+8
6. -4