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x in (-oo:+oo)
x/2+x/9 = 2+5 // - 2+5
x/2+x/9-5-2 = 0
11/18*x-7 = 0 // + 7
11/18*x = 7 // : 11/18
x = 7/11/18
x = 126/11
x = 126/11
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