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