Question 133995
(-x^2 – 6x + 3) – (-9x^2 + x – 1) – (x^2 + 5x – 2)
(-x^2 – 6x + 3 +9x^2 - x + 1 – x^2 - 5x + 2)
{{{(-x^2 +9x^2 -x^2 -6x-x-5x + 3+1+2) }}} 
{{{ 7x^2 -12x 6 }}}