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(2/3)*(2*x-1) = 10 // - 10
(2/3)*(2*x-1)-10 = 0
2/3*(2*x-1)-10 = 0
2/3*(2*x-1)-10 = 0
4/3*x-32/3 = 0
4/3*x-32/3 = 0
4/3*x-32/3 = 0 // + 32/3
4/3*x = 32/3 // : 4/3
x = 32/3/4/3
x = 8
x = 8
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