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Taking cube both the sides.
 p^{3} +8 q^{3} +3pq(p+q)=512
Simply putting the formula⇒ (a+B)^{3} =a^3+b^3+3ab(a+b)
then putting value pq=6 in the above equation. we get.
Now take 18(p+q) in the right
Now take the equation p+2q=8
now taking the value of p+q and putting in the above generated equation we get
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