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4 = x/500+1/2 // - x/500+1/2
4-(x/500)-(1/2) = 0
4-(x/500)-1/2 = 0
7/2-1/500*x = 0 // - 7/2
-1/500*x = -7/2 // : -1/500
x = -7/2/(-1/500)
x = 1750
x = 1750
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