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n in (-oo:+oo)
(2/5)*(n-3) = 12 // - 12
(2/5)*(n-3)-12 = 0
2/5*(n-3)-12 = 0
2/5*(n-3)-12 = 0
2/5*n-66/5 = 0
2/5*n-66/5 = 0
2/5*n-66/5 = 0 // + 66/5
2/5*n = 66/5 // : 2/5
n = 66/5/2/5
n = 33
n = 33
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