$\,6 + ( - \,2\,x + \,8) - ( \,1 - \,7\,x) =$ ?

$\,5\,x +\,15$ $\,5\,x \,-3$ $\,12\,x +\,6$ $\,-9\,x +\,13$ $\,5\,x +\,13$

$ \,4\,x + \,7\,y - ( \,8\,x - \,2\,y)=$ ?

$\,12\,x +\,5\,y$ $\,-4\,x +\,9\,y$ $\,-4\,x +\,5\,y$ $\,12\,x +\,9\,y$ $\,-4\,x \,-5\,y$

$\,2\,x - ( - \,7\,\,x^2 - \,3 ) + \,9\,x=$ ?

$\,7\,\,x^2 +\,11\,x \,-3$ $\,7\,\,x^2 +\,11\,x +\,3$ $\,-7\,\,x^2 +\,11\,x \,-3$ $\,-7\,\,x^2 +\,11\,x +\,3$ $\,7\,\,x^2 \,-7\,x +\,3$

$\,7\,x + (\,8 - \,4\,x + \,y) =$ ?

$\,11\,x +\,y +\,8$ $\,3\,x +\,y +\,8$ $\,11\,x \,-\,y \,-8$ $\,3\,x \,-\,y +\,8$ $\,-3\,x +\,y \,-8$

$ \,2\,\,x^2 - ( \,9 + \,8\,\,x^2 + \,9\,x)=$ ?

$\,-6\,\,x^2 +\,9\,x \,-9$ $\,10\,\,x^2 \,-9\,x \,-9$ $\,10\,\,x^2 +\,9\,x +\,9$ $\,-6\,\,x^2 +\,9\,x +\,9$ $\,-6\,\,x^2 \,-9\,x \,-9$

$ \,5\,x - \,2\,\,x^2 - ( - \,7\,\,x^2 + \,9\,x )=$ ?

$\,-9\,\,x^2 +\,14\,x$ $\,5\,\,x^2 \,-4\,x$ $\,-9\,\,x^2 \,-4\,x$ $\,9\,\,x^2 \,-4\,x$ $\,5\,\,x^2 +\,14\,x$