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p in (-oo:+oo)
2*((1/2)*p-4)-(5*p) = -((1/4)*(6*p-10))-3*p // + -((1/4)*(6*p-10))-3*p
2*((1/2)*p-4)+(1/4)*(6*p-10)-(5*p)-(-3*p) = 0
2*((1/2)*p-4)+(1/4)*(6*p-10)-5*p+3*p = 0
2*(1/2*p-4)+1/4*(6*p-10)-5*p+3*p = 0
2*(1/2*p-4)+1/4*(6*p-10)-5*p+3*p = 0
5/2*p-5*p+3*p-21/2 = 0
3*p-5/2*p-21/2 = 0
1/2*p-21/2 = 0
1/2*p-21/2 = 0
1/2*p-21/2 = 0 // + 21/2
1/2*p = 21/2 // : 1/2
p = 21/2/1/2
p = 21
p = 21
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