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