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a in (-oo:+oo)
5/12 = a/36 // - a/36
5/12-(a/36) = 0
5/12-1/36*a = 0 // - 5/12
-1/36*a = -5/12 // : -1/36
a = -5/12/(-1/36)
a = 15
a = 15
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