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(2/5)*x-15 = 5/8-6 // - 5/8-6
(2/5)*x-(5/8)-15+6 = 0
(2/5)*x-5/8-15+6 = 0
2/5*x-77/8 = 0 // + 77/8
2/5*x = 77/8 // : 2/5
x = 77/8/2/5
x = 385/16
x = 385/16
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