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x in (-oo:+oo)
x/8-(4*x) = 4 // - 4
x/8-(4*x)-4 = 0
x/8-4*x-4 = 0
-31/8*x-4 = 0 // + 4
-31/8*x = 4 // : -31/8
x = 4/(-31/8)
x = -32/31
x = -32/31
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