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x in (-oo:+oo)
y = (-9/8)*x-(9/11) // - (-9/8)*x-(9/11)
y-((-9/8)*x)+9/11 = 0
(9/8)*x+y+9/11 = 0
9/8*x+y+9/11 = 0 // - y+9/11
9/8*x = -(y+9/11) // : 9/8
x = (-(y+9/11))/9/8
x = -8/9*(y+9/11)
x = -8/9*(y+9/11)
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