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x in (-oo:+oo)
x/16 = 1600/40 // - 1600/40
x/16-(1600/40) = 0
x/16-40 = 0
1/16*x-40 = 0 // + 40
1/16*x = 40 // : 1/16
x = 40/1/16
x = 640
x = 640
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