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x in (-oo:+oo)
y+8 = (8/9)*(x-1) // - (8/9)*(x-1)
y-((8/9)*(x-1))+8 = 0
(-8/9)*(x-1)+y+8 = 0
y-8/9*(x-1)+8 = 0
y-8/9*(x-1)+8 = 0
y-8/9*x+8/9+8 = 0
y-8/9*x+80/9 = 0
y-8/9*x+80/9 = 0
y-8/9*x+80/9 = 0 // - y+80/9
-8/9*x = -(y+80/9) // : -8/9
x = (-(y+80/9))/(-8/9)
x = 9/8*(y+80/9)
x = 9/8*(y+80/9)
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