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(5/4)*x = 9-(6*x) // - 9-(6*x)
(5/4)*x+6*x-9 = 0
29/4*x-9 = 0 // + 9
29/4*x = 9 // : 29/4
x = 9/29/4
x = 36/29
x = 36/29
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