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a in (-oo:+oo)
9 = (1/2)*a // - (1/2)*a
9-((1/2)*a) = 0
(-1/2)*a+9 = 0
9-1/2*a = 0 // - 9
-1/2*a = -9 // : -1/2
a = -9/(-1/2)
a = 18
a = 18
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