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

$\,-3\,x \,-4$ $\,-3\,x +\,16$ $\,-3\,x +\,4$ $\,-5\,x +\,6$ $\,-9\,x +\,4$

$ \,4\,\,x^2 - ( \,6 + \,7\,\,x^2 + \,6\,x)=$ ?

$\,-3\,\,x^2 \,-6\,x \,-6$ $\,-3\,\,x^2 +\,6\,x +\,6$ $\,-3\,\,x^2 +\,6\,x \,-6$ $\,11\,\,x^2 +\,6\,x +\,6$ $\,11\,\,x^2 \,-6\,x \,-6$

$ \,3\,x - \,\,x^2 - ( - \,8\,\,x^2 + \,7\,x )=$ ?

$\,7\,\,x^2 +\,10\,x$ $\,7\,\,x^2 \,-4\,x$ $\,-9\,\,x^2 \,-4\,x$ $\,-9\,\,x^2 +\,10\,x$ $\,9\,\,x^2 \,-4\,x$

$ \,8\,x + \,6\,y - ( \,5\,x - \,9\,y)=$ ?

$\,3\,x \,-3\,y$ $\,13\,x +\,15\,y$ $\,13\,x \,-3\,y$ $\,3\,x +\,3\,y$ $\,3\,x +\,15\,y$

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

$\,13\,x +\,9\,y +\,8$ $\,3\,x \,-9\,y +\,8$ $\,13\,x \,-9\,y \,-8$ $\,-3\,x +\,9\,y \,-8$ $\,3\,x +\,9\,y +\,8$

$\,2\,x - ( - \,5\,\,x^2 - \,4 ) + \,3\,x=$ ?

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