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x in (-oo:+oo)
6000 = (1/2)*x // - (1/2)*x
6000-((1/2)*x) = 0
(-1/2)*x+6000 = 0
6000-1/2*x = 0 // - 6000
-1/2*x = -6000 // : -1/2
x = -6000/(-1/2)
x = 12000
x = 12000
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