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