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x in (-oo:+oo)
(0.8*x)/100 = 80 // - 80
(0.8*x)/100-80 = 0
0.008*x-80 = 0 // + 80
0.008*x = 80 // : 0.008
x = 80/0.008
x = 10000
x = 10000
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