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(2/3)*(2*x-(1/2)) = 13 // - 13
(2/3)*(2*x-(1/2))-13 = 0
(2/3)*(2*x-1/2)-13 = 0
2/3*(2*x-1/2)-13 = 0
2/3*(2*x-1/2)-13 = 0
4/3*x-40/3 = 0
4/3*x-40/3 = 0
4/3*x-40/3 = 0 // + 40/3
4/3*x = 40/3 // : 4/3
x = 40/3/4/3
x = 10
x = 10
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