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p in (-oo:+oo)
(21/5)*((-13/4)*p+5) = 651/5 // - 651/5
(21/5)*((-13/4)*p+5)-(651/5) = 0
(21/5)*((-13/4)*p+5)-651/5 = 0
21/5*(5-13/4*p)-651/5 = 0
(21/5*5*(5-13/4*p))/5-651/5 = 0
21/5*5*(5-13/4*p)-651 = 0
-273/4*p-546 = 0
(-273/4*p-546)/5 = 0
(-273/4*p-546)/5 = 0 // * 5
-273/4*p-546 = 0
-273/4*p-546 = 0 // + 546
-273/4*p = 546 // : -273/4
p = 546/(-273/4)
p = -8
p = -8
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