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x in (-oo:+oo)
250 = x+x/2 // - x+x/2
250-x-(x/2) = 0
250-3/2*x = 0 // - 250
-3/2*x = -250 // : -3/2
x = -250/(-3/2)
x = 500/3
x = 500/3
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