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x in (-oo:+oo)
1/8-(x/2) = 4 // - 4
1/8-(x/2)-4 = 0
-1/2*x-31/8 = 0 // + 31/8
-1/2*x = 31/8 // : -1/2
x = 31/8/(-1/2)
x = -31/4
x = -31/4
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