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7*x-(5/4) = 4 // - 4
7*x-(5/4)-4 = 0
7*x-5/4-4 = 0
7*x-21/4 = 0 // + 21/4
7*x = 21/4 // : 7
x = 21/4/7
x = 3/4
x = 3/4
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