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n in (-oo:+oo)
(3/4)*(n-3) = 18 // - 18
(3/4)*(n-3)-18 = 0
3/4*(n-3)-18 = 0
3/4*(n-3)-18 = 0
3/4*n-81/4 = 0
3/4*n-81/4 = 0
3/4*n-81/4 = 0 // + 81/4
3/4*n = 81/4 // : 3/4
n = 81/4/3/4
n = 27
n = 27
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