Question 118564
{{{(6*x+9)-(2*x+4)}}}


First step is to distribute the minus sign in front of the second set of parentheses:


{{{(6x+9)-2x-4}}}


We don't need the first set of parentheses, so:


{{{6x+9-2x-4}}}


Next thing is to group like terms, put the x's with the x's and the constants with the constants:


{{{6x-2x+9-4}}}


Finally, combine the like terms:
{{{4x+5}}}


Done.


Hope that helps,
John