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