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(2/3)*x-(1/4) = 5/8 // - 5/8
(2/3)*x-(1/4)-(5/8) = 0
(2/3)*x-1/4-5/8 = 0
2/3*x-7/8 = 0 // + 7/8
2/3*x = 7/8 // : 2/3
x = 7/8/2/3
x = 21/16
x = 21/16
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