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a in (-oo:+oo)
9/10 = a/6 // - a/6
9/10-(a/6) = 0
9/10-1/6*a = 0 // - 9/10
-1/6*a = -9/10 // : -1/6
a = -9/10/(-1/6)
a = 27/5
a = 27/5
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