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x in (-oo:+oo)
x/160 = 160/3200 // - 160/3200
x/160-(160/3200) = 0
x/160-1/20 = 0
1/160*x-1/20 = 0 // + 1/20
1/160*x = 1/20 // : 1/160
x = 1/20/1/160
x = 8
x = 8
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