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x in (-oo:+oo)
2401 = (1/2)*x // - (1/2)*x
2401-((1/2)*x) = 0
(-1/2)*x+2401 = 0
2401-1/2*x = 0 // - 2401
-1/2*x = -2401 // : -1/2
x = -2401/(-1/2)
x = 4802
x = 4802
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