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x in (-oo:+oo)
0.5 = x/300 // - x/300
0.5-(x/300) = 0
0.5-1/300*x = 0 // - 0.5
-1/300*x = -0.5 // : -1/300
x = -0.5/(-1/300)
x = 150.00015
x = 150.00015
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