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X/8 = x/9-9 // - x/9-9
X/8-(x/9)+9 = 0
1/8*X-1/9*x+9 = 0 // - 1/8*X+9
-1/9*x = -(1/8*X+9) // : -1/9
x = (-(1/8*X+9))/(-1/9)
x = 9*(1/8*X+9)
x = 9*(1/8*X+9)
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