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x in (-oo:+oo)
y+6 = (8/9)*x-(40/9) // - (8/9)*x-(40/9)
y-((8/9)*x)+40/9+6 = 0
(-8/9)*x+y+40/9+6 = 0
y-8/9*x+94/9 = 0 // - y+94/9
-8/9*x = -(y+94/9) // : -8/9
x = (-(y+94/9))/(-8/9)
x = 9/8*(y+94/9)
x = 9/8*(y+94/9)
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