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x in (-oo:+oo)
x/7+x/9 = 16/63 // - 16/63
x/7+x/9-(16/63) = 0
x/7+x/9-16/63 = 0
16/63*x-16/63 = 0 // + 16/63
16/63*x = 16/63 // : 16/63
x = 16/63/16/63
x = 1
x = 1
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