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X/3 = 9-(x/5) // - 9-(x/5)
X/3+x/5-9 = 0
1/3*X+1/5*x-9 = 0 // - 1/3*X-9
1/5*x = -(1/3*X-9) // : 1/5
x = (-(1/3*X-9))/1/5
x = 5*(9-(1/3*X))
x = 5*(9-(1/3*X))
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