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a in (-oo:+oo)
500 = (1/2)*17^2*a // - (1/2)*17^2*a
500-((1/2)*17^2*a) = 0
(-1/2)*17^2*a+500 = 0
500-289/2*a = 0 // - 500
-289/2*a = -500 // : -289/2
a = -500/(-289/2)
a = 1000/289
a = 1000/289
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