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(2/5)*(2*x-3) = 6 // - 6
(2/5)*(2*x-3)-6 = 0
2/5*(2*x-3)-6 = 0
2/5*(2*x-3)-6 = 0
4/5*x-36/5 = 0
4/5*x-36/5 = 0
4/5*x-36/5 = 0 // + 36/5
4/5*x = 36/5 // : 4/5
x = 36/5/4/5
x = 9
x = 9
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