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a in (-oo:+oo)
a/2 = a/9+1/2 // - a/9+1/2
a/2-(a/9)-(1/2) = 0
a/2-(a/9)-1/2 = 0
7/18*a-1/2 = 0 // + 1/2
7/18*a = 1/2 // : 7/18
a = 1/2/7/18
a = 9/7
a = 9/7
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