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(1/3)*(6*x+9)+3 = 12 // - 12
(1/3)*(6*x+9)-12+3 = 0
1/3*(6*x+9)-12+3 = 0
1/3*(6*x+9)-12+3 = 0
2*x-9+3 = 0
2*x-6 = 0
2*x-6 = 0
2*x-6 = 0 // + 6
2*x = 6 // : 2
x = 6/2
x = 3
x = 3
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