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X in (-oo:+oo)
(1/3)*(X+9) = 12 // - 12
(1/3)*(X+9)-12 = 0
1/3*(X+9)-12 = 0
1/3*(X+9)-12 = 0
1/3*X-9 = 0
1/3*X-9 = 0
1/3*X-9 = 0 // + 9
1/3*X = 9 // : 1/3
X = 9/1/3
X = 27
X = 27
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