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7*x+9*x+2/6+1/3 = 9 // - 9
7*x+9*x+2/6+1/3-9 = 0
16*x-25/3 = 0 // + 25/3
16*x = 25/3 // : 16
x = 25/3/16
x = 25/48
x = 25/48
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