Question 1049592
the word please is attractive

Please help me to remove the grouping symbols and simplify the following :
first part 
1) {{{(8x^3-(4x^2+6x)+3x^3-(5x^2-9x+8))}}}
 {{{(8x^3-4x^2-6x+3x^3-5x^2+9x-8)}}}
{{{(11x^3-9x^2+3x-8)}}}

do the same for the rest.