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(2/3)*(2*x-1) = -12 // + 12
(2/3)*(2*x-1)+12 = 0
2/3*(2*x-1)+12 = 0
2/3*(2*x-1)+12 = 0
4/3*x+34/3 = 0
4/3*x+34/3 = 0
4/3*x+34/3 = 0 // - 34/3
4/3*x = -34/3 // : 4/3
x = -34/3/4/3
x = -17/2
x = -17/2
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