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x in (-oo:+oo)
0.6/1.2 = x/200 // - x/200
0.6/1.2-(x/200) = 0
0.5-1/200*x = 0 // - 0.5
-1/200*x = -0.5 // : -1/200
x = -0.5/(-1/200)
x = 100
x = 100
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