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a in (-oo:+oo)
1/5 = a/3 // - a/3
1/5-(a/3) = 0
1/5-1/3*a = 0 // - 1/5
-1/3*a = -1/5 // : -1/3
a = -1/5/(-1/3)
a = 3/5
a = 3/5
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