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x in (-oo:+oo)
-x-((1/8)*x) = 3-((1/16)*x) // - 3-((1/16)*x)
(1/16)*x-x-((1/8)*x)-3 = 0
(-1/8)*x-x+(1/16)*x-3 = 0
-17/16*x-3 = 0 // + 3
-17/16*x = 3 // : -17/16
x = 3/(-17/16)
x = -48/17
x = -48/17
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