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a in (-oo:+oo)
(a-5)/10 = 200 // - 200
(a-5)/10-200 = 0
(a-5)/10+(-200*10)/10 = 0
a-200*10-5 = 0
a-2005 = 0
(a-2005)/10 = 0
(a-2005)/10 = 0 // * 10
a-2005 = 0
a-2005 = 0 // + 2005
a = 2005
a = 2005
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