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n in (-oo:+oo)
(3/4)*n-1 = 12 // - 12
(3/4)*n-12-1 = 0
3/4*n-13 = 0 // + 13
3/4*n = 13 // : 3/4
n = 13/3/4
n = 52/3
n = 52/3
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