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x in (-oo:+oo)
-1/8-(-6/8) = x // - x
-x-1/8-(-6/8) = 0
3/4-x-1/8 = 0
5/8-x = 0 // - 5/8
-x = -5/8 // * -1
x = 5/8
x = 5/8
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