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a in (-oo:+oo)
(-50*a)/50 = 54/(-50) // - 54/(-50)
(-50*a)/50-(54/(-50)) = 0
(-50*a)/50+27/25 = 0
27/25-a = 0 // - 27/25
-a = -27/25 // * -1
a = 27/25
a = 27/25
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