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5*x+4*x+5/6+5/2 = 9 // - 9
5*x+4*x+5/6+5/2-9 = 0
9*x-17/3 = 0 // + 17/3
9*x = 17/3 // : 9
x = 17/3/9
x = 17/27
x = 17/27
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