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(2/3)*x-4 = 5/4 // - 5/4
(2/3)*x-(5/4)-4 = 0
(2/3)*x-5/4-4 = 0
2/3*x-21/4 = 0 // + 21/4
2/3*x = 21/4 // : 2/3
x = 21/4/2/3
x = 63/8
x = 63/8
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