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y-6 = (-7/6)*(x-6) // - (-7/6)*(x-6)
y-((-7/6)*(x-6))-6 = 0
(7/6)*(x-6)+y-6 = 0
7/6*(x-6)+y-6 = 0
7/6*(x-6)+y-6 = 0
7/6*x+y-7-6 = 0
7/6*x+y-13 = 0
7/6*x+y-13 = 0
7/6*x+y-13 = 0 // - y-13
7/6*x = -(y-13) // : 7/6
x = (-(y-13))/7/6
x = 6/7*(13-y)
x = 6/7*(13-y)
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