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