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n in (-oo:+oo)
n = (1/2)*(-19)^2 // - (1/2)*(-19)^2
n-((1/2)*(-19)^2) = 0
n+(-1/2)*19^2 = 0
n-361/2 = 0 // + 361/2
n = 361/2
n = 361/2
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