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x in (-oo:+oo)
y+11 = (7/6)*(x+9) // - (7/6)*(x+9)
y-((7/6)*(x+9))+11 = 0
(-7/6)*(x+9)+y+11 = 0
y-7/6*(x+9)+11 = 0
y-7/6*(x+9)+11 = 0
y-7/6*x-21/2+11 = 0
y-7/6*x+1/2 = 0
y-7/6*x+1/2 = 0
y-7/6*x+1/2 = 0 // - y+1/2
-7/6*x = -(y+1/2) // : -7/6
x = (-(y+1/2))/(-7/6)
x = 6/7*(y+1/2)
x = 6/7*(y+1/2)
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