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4*x-(9/2) = 8 // - 8
4*x-(9/2)-8 = 0
4*x-9/2-8 = 0
4*x-25/2 = 0 // + 25/2
4*x = 25/2 // : 4
x = 25/2/4
x = 25/8
x = 25/8
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