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x in (-oo:+oo)
x/7 = 2/9 // - 2/9
x/7-(2/9) = 0
x/7-2/9 = 0
1/7*x-2/9 = 0 // + 2/9
1/7*x = 2/9 // : 1/7
x = 2/9/1/7
x = 14/9
x = 14/9
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