Question 63722
The given expression is: 


{{{(8/x^2)}}} + 6x - {{{(3/x^2)}}} + 4x - 12 


Grouping the like terms, that is x and {{{x^2}}} and the constants, we get: 


{{{(8/x^2)}}} - {{{(3/x^2)}}} + 6x + 4x - 12 


{{{(5/x^2)}}} + 10x - 12 


Hence, the solution.