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x in (-oo:+oo)
x/7-1 = x/9+1 // - x/9+1
x/7-(x/9)-1-1 = 0
2/63*x-2 = 0 // + 2
2/63*x = 2 // : 2/63
x = 2/2/63
x = 63
x = 63
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