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p in (-oo:+oo)
8 = (21*p)/100 // - (21*p)/100
8-((21*p)/100) = 0
(-21/100)*p+8 = 0
8-21/100*p = 0 // - 8
-21/100*p = -8 // : -21/100
p = -8/(-21/100)
p = 800/21
p = 800/21
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