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(2/5)*x-(3/8) = 7/4 // - 7/4
(2/5)*x-(3/8)-(7/4) = 0
(2/5)*x-3/8-7/4 = 0
2/5*x-17/8 = 0 // + 17/8
2/5*x = 17/8 // : 2/5
x = 17/8/2/5
x = 85/16
x = 85/16
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