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(2/5)*(2*x-1) = 10 // - 10
(2/5)*(2*x-1)-10 = 0
2/5*(2*x-1)-10 = 0
2/5*(2*x-1)-10 = 0
4/5*x-52/5 = 0
4/5*x-52/5 = 0
4/5*x-52/5 = 0 // + 52/5
4/5*x = 52/5 // : 4/5
x = 52/5/4/5
x = 13
x = 13
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