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x in (-oo:+oo)
18/60 = x/500 // - x/500
18/60-(x/500) = 0
3/10-1/500*x = 0 // - 3/10
-1/500*x = -3/10 // : -1/500
x = -3/10/(-1/500)
x = 150
x = 150
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