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x in (-oo:+oo)
(0*(x/100))/80 = 0
0 = 0
(0*(x/100))/80 = 0 // * 80
0*(x/100) = 0
0 = 0
x/100 = 0
1/100*x = 0 // : 1/100
x = 0
0*(x/100) = 0 <=> 0 = 0 or 0*(x/100) = 0 <=> x/100 = 0
x in (-oo:+oo)
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