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n in (-oo:+oo)
3*n-3/8 = -27/40 // + -27/40
3*n-3/8-(-27/40) = 0
3*n-3/8+27/40 = 0
3*n+3/10 = 0 // - 3/10
3*n = -3/10 // : 3
n = -3/10/3
n = -1/10
n = -1/10
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