$\,2\,x + (\,6 - \,x + \,4\,y) =$ ?

$\,3\,x +\,4\,y +\,6$ $\,x +\,4\,y +\,6$ $\,3\,x \,-4\,y \,-6$ $\,-\,x +\,4\,y \,-6$ $\,x \,-4\,y +\,6$

$ \,5\,x - \,4\,\,x^2 - ( - \,5\,\,x^2 + \,9\,x )=$ ?

$\,\,x^2 \,-4\,x$ $\,9\,\,x^2 \,-4\,x$ $\,-9\,\,x^2 \,-4\,x$ $\,-9\,\,x^2 +\,14\,x$ $\,\,x^2 +\,14\,x$

$\,3 + ( - \,8\,x + \,9) - ( \,9 - \,9\,x) =$ ?

$\,-17\,x +\,3$ $\,x +\,3$ $\,x +\,21$ $\,x \,-15$

$ \,3\,\,x^2 - ( \,6 + \,2\,\,x^2 + \,2\,x)=$ ?

$\,\,x^2 \,-2\,x \,-6$ $\,5\,\,x^2 +\,2\,x +\,6$ $\,5\,\,x^2 \,-2\,x \,-6$ $\,\,x^2 +\,2\,x +\,6$ $\,\,x^2 +\,2\,x \,-6$

$\,9\,x - ( - \,\,x^2 - \,9 ) + \,6\,x=$ ?

$\,\,x^2 +\,15\,x \,-9$ $\,\,x^2 +\,15\,x +\,9$ $\,\,x^2 +\,3\,x +\,9$ $\,-\,\,x^2 +\,15\,x +\,9$ $\,-\,\,x^2 +\,15\,x \,-9$

$ \,4\,x + \,5\,y - ( \,5\,x - \,8\,y)=$ ?

$\,-\,x +\,3\,y$ $\,9\,x +\,13\,y$ $\,-\,x \,-3\,y$ $\,-\,x +\,13\,y$ $\,9\,x \,-3\,y$