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x-3 = (4/5)*(9-(9*x)) // - (4/5)*(9-(9*x))
x-((4/5)*(9-(9*x)))-3 = 0
(-4/5)*(9-9*x)+x-3 = 0
x-4/5*(9-9*x)-3 = 0
x-4/5*(9-9*x)-3 = 0
41/5*x-36/5-3 = 0
41/5*x-51/5 = 0
41/5*x-51/5 = 0
41/5*x-51/5 = 0 // + 51/5
41/5*x = 51/5 // : 41/5
x = 51/5/41/5
x = 51/41
x = 51/41
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