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x in (-oo:+oo)
y-7 = (6/7)*(x-6) // - (6/7)*(x-6)
y-((6/7)*(x-6))-7 = 0
(-6/7)*(x-6)+y-7 = 0
y-6/7*(x-6)-7 = 0
y-6/7*(x-6)-7 = 0
y-6/7*x-7+36/7 = 0
y-6/7*x-13/7 = 0
y-6/7*x-13/7 = 0
y-6/7*x-13/7 = 0 // - y-13/7
-6/7*x = -(y-13/7) // : -6/7
x = (-(y-13/7))/(-6/7)
x = -7/6*(13/7-y)
x = -7/6*(13/7-y)
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