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x in (-oo:+oo)
y-80 = (-11/8)*(x+0) // - (-11/8)*(x+0)
y-((-11/8)*(x+0))-80 = 0
(11/8)*x+y-80 = 0
11/8*x+y-80 = 0 // - y-80
11/8*x = -(y-80) // : 11/8
x = (-(y-80))/11/8
x = 8/11*(80-y)
x = 8/11*(80-y)
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