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(1/3)*(x+9)+12 = 0
1/3*(x+9)+12 = 0
1/3*(x+9)+12 = 0
1/3*x+15 = 0
1/3*x+15 = 0
1/3*x+15 = 0 // - 15
1/3*x = -15 // : 1/3
x = -15/1/3
x = -45
x = -45
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