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

$\,5\,x +\,10\,y$ $\,-\,x +\,10\,y$ $\,-\,x \,-2\,y$ $\,-\,x +\,2\,y$ $\,5\,x \,-2\,y$

$ \,7\,\,x^2 - ( \,3 + \,5\,\,x^2 + \,5\,x)=$ ?

$\,2\,\,x^2 \,-5\,x \,-3$ $\,2\,\,x^2 +\,5\,x +\,3$ $\,12\,\,x^2 +\,5\,x +\,3$ $\,2\,\,x^2 +\,5\,x \,-3$ $\,12\,\,x^2 \,-5\,x \,-3$

$ \,8\,x - \,5\,\,x^2 - ( - \,\,x^2 + \,7\,x )=$ ?

$\,-6\,\,x^2 +\,x$ $\,6\,\,x^2 +\,x$ $\,-6\,\,x^2 +\,15\,x$ $\,-4\,\,x^2 +\,x$ $\,-4\,\,x^2 +\,15\,x$

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

$\,2\,x +\,1$ $\,-4\,x +\,1$ $\,-3\,x +\,6$ $\,2\,x \,-5$ $\,2\,x +\,17$

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

$\,11\,x \,-2\,y \,-4$ $\,3\,x \,-2\,y +\,4$ $\,3\,x +\,2\,y +\,4$ $\,-3\,x +\,2\,y \,-4$ $\,11\,x +\,2\,y +\,4$

$\,9\,x - ( - \,7\,\,x^2 - \,4 ) + \,8\,x=$ ?

$\,7\,\,x^2 +\,x +\,4$ $\,-7\,\,x^2 +\,17\,x \,-4$ $\,7\,\,x^2 +\,17\,x +\,4$ $\,7\,\,x^2 +\,17\,x \,-4$ $\,-7\,\,x^2 +\,17\,x +\,4$