Question 359538
{{{(-7x^-8)(3x^2)=-21x^(-8+2)=-21x^(-6)=-21/x^6}}}
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{{{(x^11/x^5)^(-3)= (x^(11-5))^(-3)}}}
{{{(x^11/x^5)^(-3)= (x^(6))^(-3)}}}
{{{(x^11/x^5)^(-3)=  x^(-18)}}}
{{{(x^11/x^5)^(-3)=  1/x^(18)}}}