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(1/3)*(6*x+27) = -12 // + 12
(1/3)*(6*x+27)+12 = 0
1/3*(6*x+27)+12 = 0
1/3*(6*x+27)+12 = 0
2*x+21 = 0
2*x+21 = 0
2*x+21 = 0 // - 21
2*x = -21 // : 2
x = -21/2
x = -21/2
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