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x in (-oo:+oo)
3/4 = x/500 // - x/500
3/4-(x/500) = 0
3/4-1/500*x = 0 // - 3/4
-1/500*x = -3/4 // : -1/500
x = -3/4/(-1/500)
x = 375
x = 375
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