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n in (-oo:+oo)
(3/4)*n-18 = (1/4)*n-4 // - (1/4)*n-4
(3/4)*n-((1/4)*n)-18+4 = 0
(3/4)*n+(-1/4)*n-18+4 = 0
1/2*n-14 = 0 // + 14
1/2*n = 14 // : 1/2
n = 14/1/2
n = 28
n = 28
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