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a in (-oo:+oo)
3/6 = a/18 // - a/18
3/6-(a/18) = 0
1/2-1/18*a = 0 // - 1/2
-1/18*a = -1/2 // : -1/18
a = -1/2/(-1/18)
a = 9
a = 9
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