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(1/3)*(3*x+9)-5 = 4 // - 4
(1/3)*(3*x+9)-5-4 = 0
1/3*(3*x+9)-5-4 = 0
1/3*(3*x+9)-5-4 = 0
x-4-2 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x = 6
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