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n in (-oo:+oo)
(3/4)*n-18 = (1/4)*n // - (1/4)*n
(3/4)*n-((1/4)*n)-18 = 0
(3/4)*n+(-1/4)*n-18 = 0
1/2*n-18 = 0 // + 18
1/2*n = 18 // : 1/2
n = 18/1/2
n = 36
n = 36
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