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x in (-oo:+oo)
99-((1/2)*x) = x // - x
99-((1/2)*x)-x = 0
(-1/2)*x-x+99 = 0
99-3/2*x = 0 // - 99
-3/2*x = -99 // : -3/2
x = -99/(-3/2)
x = 66
x = 66
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