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a in (-oo:+oo)
11/15 = a/30 // - a/30
11/15-(a/30) = 0
11/15-1/30*a = 0 // - 11/15
-1/30*a = -11/15 // : -1/30
a = -11/15/(-1/30)
a = 22
a = 22
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