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x in (-oo:+oo)
-x-(1/8) = (-4/5)*x+7/200 // - (-4/5)*x+7/200
-x-((-4/5)*x)-(1/8)-(7/200) = 0
(4/5)*x-x-1/8-7/200 = 0
-1/5*x-4/25 = 0 // + 4/25
-1/5*x = 4/25 // : -1/5
x = 4/25/(-1/5)
x = -4/5
x = -4/5
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