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(1/3)*(6*x-3) = -28 // + 28
(1/3)*(6*x-3)+28 = 0
1/3*(6*x-3)+28 = 0
1/3*(6*x-3)+28 = 0
2*x+27 = 0
2*x+27 = 0
2*x+27 = 0 // - 27
2*x = -27 // : 2
x = -27/2
x = -27/2
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