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x in (-oo:+oo)
y+6 = (2/11)*(x+13) // - (2/11)*(x+13)
y-((2/11)*(x+13))+6 = 0
(-2/11)*(x+13)+y+6 = 0
y-2/11*(x+13)+6 = 0
y-2/11*(x+13)+6 = 0
y-2/11*x-26/11+6 = 0
y-2/11*x+40/11 = 0
y-2/11*x+40/11 = 0
y-2/11*x+40/11 = 0 // - y+40/11
-2/11*x = -(y+40/11) // : -2/11
x = (-(y+40/11))/(-2/11)
x = 11/2*(y+40/11)
x = 11/2*(y+40/11)
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