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A in (-oo:+oo)
5/15 = A/45 // - A/45
5/15-(A/45) = 0
1/3-1/45*A = 0 // - 1/3
-1/45*A = -1/3 // : -1/45
A = -1/3/(-1/45)
A = 15
A = 15
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