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X/8+x/9 = 17/72 // - 17/72
X/8+x/9-(17/72) = 0
X/8+x/9-17/72 = 0
1/8*X+1/9*x-17/72 = 0 // - 1/8*X-17/72
1/9*x = -(1/8*X-17/72) // : 1/9
x = (-(1/8*X-17/72))/1/9
x = 9*(17/72-(1/8*X))
x = 9*(17/72-(1/8*X))
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