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x in (-oo:+oo)
200000 = (0.5*100*x)/0.5 // - (0.5*100*x)/0.5
200000-((0.5*100*x)/0.5) = 0
200000-100*x = 0
200000-100*x = 0 // - 200000
-100*x = -200000 // : -100
x = -200000/(-100)
x = 2000
x = 2000
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