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x in (-oo:+oo)
1/20 = x/300 // - x/300
1/20-(x/300) = 0
1/20-1/300*x = 0 // - 1/20
-1/300*x = -1/20 // : -1/300
x = -1/20/(-1/300)
x = 15
x = 15
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