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p in (-oo:+oo)
(p-12)/2 = 2*p-16+10 // - 2*p-16+10
(p-12)/2-(2*p)-10+16 = 0
(p-12)/2-2*p-10+16 = 0
(p-12)/2+(-2*2*p)/2+(-10*2)/2+(2*16)/2 = 0
p-2*2*p-10*2+2*16-12 = 0
32-3*p-20-12 = 0
32-3*p-32 = 0
-3*p = 0
(-3*p)/2 = 0
(-3*p)/2 = 0 // * 2
-3*p = 0
-3*p = 0 // : -3
p = 0
p = 0
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