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(2/3)*(6*x-1)+2/3 = 4 // - 4
(2/3)*(6*x-1)+2/3-4 = 0
2/3*(6*x-1)+2/3-4 = 0
(2/3*3*(6*x-1))/3+2/3+(-4*3)/3 = 0
2/3*3*(6*x-1)-4*3+2 = 0
12*x-12 = 0
(12*x-12)/3 = 0
(12*x-12)/3 = 0 // * 3
12*x-12 = 0
12*x-12 = 0 // + 12
12*x = 12 // : 12
x = 12/12
x = 1
x = 1
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