$ \,6\,x - \,7\,\,x^2 - ( - \,8\,\,x^2 + \,9\,x )=$ ?

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

$ \,3\,\,x^2 - ( \,6 + \,9\,\,x^2 + \,3\,x)=$ ?

$\,12\,\,x^2 +\,3\,x +\,6$ $\,-6\,\,x^2 \,-3\,x \,-6$ $\,12\,\,x^2 \,-3\,x \,-6$ $\,-6\,\,x^2 +\,3\,x +\,6$ $\,-6\,\,x^2 +\,3\,x \,-6$

$\,1 + ( - \,2\,x + \,3) - ( \,1 - \,x) =$ ?

$\,x +\,1$ $\,-\,x +\,3$ $\,-\,x \,-3$ $\,-3\,x +\,3$ $\,-\,x +\,5$

$ \,8\,x + \,9\,y - ( \,5\,x - \,3\,y)=$ ?

$\,13\,x +\,6\,y$ $\,3\,x +\,12\,y$ $\,13\,x +\,12\,y$ $\,3\,x +\,6\,y$ $\,3\,x \,-6\,y$

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

$\,6\,x +\,8\,y +\,8$ $\,10\,x +\,8\,y +\,8$ $\,-6\,x +\,8\,y \,-8$ $\,10\,x \,-8\,y \,-8$ $\,6\,x \,-8\,y +\,8$

$\,4\,x - ( - \,3\,\,x^2 - \,6 ) + \,8\,x=$ ?

$\,3\,\,x^2 +\,12\,x \,-6$ $\,3\,\,x^2 +\,12\,x +\,6$ $\,-3\,\,x^2 +\,12\,x \,-6$ $\,-3\,\,x^2 +\,12\,x +\,6$ $\,3\,\,x^2 \,-4\,x +\,6$