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n in (-oo:+oo)
1/4 = n+3/4 // - n+3/4
1/4-n-(3/4) = 0
1/4-n-3/4 = 0
-n-1/2 = 0 // + 1/2
-n = 1/2 // * -1
n = -1/2
n = -1/2
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