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p in (-oo:+oo)
(3*p)/(-1) = 5*(p-1)-(2*(7-(2*p))) // - 5*(p-1)-(2*(7-(2*p)))
2*(7-(2*p))-(5*(p-1))+(3*p)/(-1) = 0
2*(7-2*p)-5*(p-1)-3*p = 0
2*(7-2*p)-5*(p-1)-3*p = 0
19-9*p-3*p = 0
19-12*p = 0
19-12*p = 0
19-12*p = 0 // - 19
-12*p = -19 // : -12
p = -19/(-12)
p = 19/12
p = 19/12
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