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x in (-oo:+oo)
(1-x)/500 = 0.005 // - 0.005
(1-x)/500-0.005 = 0
(1-x)/500+(-0.005*500)/500 = 0
1-x-0.005*500 = 0
-x-1.5 = 0
(-x-1.5)/500 = 0
(-x-1.5)/500 = 0 // * 500
-x-1.5 = 0
-x-1.5 = 0 // + 1.5
-x = 1.5 // * -1
x = -1.5
x = -1.5
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