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n in (-oo:+oo)
(2/3)*(6*n-9) = 20 // - 20
(2/3)*(6*n-9)-20 = 0
2/3*(6*n-9)-20 = 0
2/3*(6*n-9)-20 = 0
4*n-26 = 0
4*n-26 = 0
4*n-26 = 0 // + 26
4*n = 26 // : 4
n = 26/4
n = 13/2
n = 13/2
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