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a in (-oo:+oo)
16 = (1/2)*a // - (1/2)*a
16-((1/2)*a) = 0
(-1/2)*a+16 = 0
16-1/2*a = 0 // - 16
-1/2*a = -16 // : -1/2
a = -16/(-1/2)
a = 32
a = 32
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