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X/5+(8*x)/9 = x/45 // - x/45
X/5+(8*x)/9-(x/45) = 0
1/5*X+13/15*x = 0 // - 1/5*X
13/15*x = -(1/5*X) // : 13/15
x = (-(1/5*X))/13/15
x = -3/13*X
x = -3/13*X
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