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n in (-oo:+oo)
(3/4)*n = (7/4)*n-18 // - (7/4)*n-18
(3/4)*n-((7/4)*n)+18 = 0
(3/4)*n+(-7/4)*n+18 = 0
18-n = 0 // - 18
-n = -18 // * -1
n = 18
n = 18
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