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p in (-oo:+oo)
(-21/5)*p-(21/2) = 2*p-72/5 // - 2*p-72/5
(-21/5)*p-(2*p)-(21/2)-(-72/5) = 0
(-21/5)*p-2*p-21/2+72/5 = 0
39/10-31/5*p = 0 // - 39/10
-31/5*p = -39/10 // : -31/5
p = -39/10/(-31/5)
p = 39/62
p = 39/62
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