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a in (-oo:+oo)
a = (29*0.5^2)/5.7 // - (29*0.5^2)/5.7
a-((29*0.5^2)/5.7) = 0
a-5.0877193*0.5^2 = 0
a-5.0877193*0.5^2 = 0 // + -5.0877193*0.5^2
a = -(-5.0877193*0.5^2)
a = 5.0877193*0.5^2
a = 5.0877193*0.5^2
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