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n in (-oo:+oo)
(3/4)*(4*n-12) = 3 // - 3
(3/4)*(4*n-12)-3 = 0
3/4*(4*n-12)-3 = 0
3/4*(4*n-12)-3 = 0
3*n-12 = 0
3*n-12 = 0
3*n-12 = 0 // + 12
3*n = 12 // : 3
n = 12/3
n = 4
n = 4
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