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a in (-oo:+oo)
a/5-(5/6) = a/3 // - a/3
a/5-(a/3)-(5/6) = 0
a/5-(a/3)-5/6 = 0
-2/15*a-5/6 = 0 // + 5/6
-2/15*a = 5/6 // : -2/15
a = 5/6/(-2/15)
a = -25/4
a = -25/4
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