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