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n in (-oo:+oo)
5*n-1/2 = -21/2 // + -21/2
5*n-1/2-(-21/2) = 0
5*n-1/2+21/2 = 0
5*n+10 = 0 // - 10
5*n = -10 // : 5
n = -10/5
n = -2
n = -2
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