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n in (-oo:+oo)
(3/4)*n-18 = 4 // - 4
(3/4)*n-18-4 = 0
3/4*n-22 = 0 // + 22
3/4*n = 22 // : 3/4
n = 22/3/4
n = 88/3
n = 88/3
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