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p in (-oo:+oo)
2.5*((2*p)/5) = (5*p)/12.5 // - (5*p)/12.5
2.5*((2*p)/5)-((5*p)/12.5) = 0
2.5*((2*p)/5)-0.4*p = 0
0.6*p = 0 // : 0.6
p = 0
p = 0
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