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x in (-oo:+oo)
y = (-1/6)*x-40 // - (-1/6)*x-40
y-((-1/6)*x)+40 = 0
(1/6)*x+y+40 = 0
1/6*x+y+40 = 0 // - y+40
1/6*x = -(y+40) // : 1/6
x = (-(y+40))/1/6
x = -6*(y+40)
x = -6*(y+40)
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