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n in (-oo:+oo)
(3/4)*n = 13/4-18 // - 13/4-18
(3/4)*n-(13/4)+18 = 0
(3/4)*n-13/4+18 = 0
3/4*n+59/4 = 0 // - 59/4
3/4*n = -59/4 // : 3/4
n = -59/4/3/4
n = -59/3
n = -59/3
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