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x in (-oo:+oo)
y = (-5/6)*x-2.5 // - (-5/6)*x-2.5
y-((-5/6)*x)+2.5 = 0
(5/6)*x+y+2.5 = 0
5/6*x+y+2.5 = 0 // - y+2.5
5/6*x = -(y+2.5) // : 5/6
x = (-(y+2.5))/5/6
x = -6/5*(y+2.5)
x = -6/5*(y+2.5)
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