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6-5*x = 9/4 // - 9/4
6-5*x-(9/4) = 0
6-5*x-9/4 = 0
15/4-5*x = 0 // - 15/4
-5*x = -15/4 // : -5
x = -15/4/(-5)
x = 3/4
x = 3/4
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