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n in (-oo:+oo)
(3/4)*n-9 = -13 // + 13
(3/4)*n-9+13 = 0
3/4*n+4 = 0 // - 4
3/4*n = -4 // : 3/4
n = -4/3/4
n = -16/3
n = -16/3
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