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

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

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

$\,2\,\,x^2 \,-\,x +\,1$ $\,2\,\,x^2 +\,15\,x +\,1$ $\,2\,\,x^2 +\,15\,x \,-1$ $\,-2\,\,x^2 +\,15\,x \,-1$ $\,-2\,\,x^2 +\,15\,x +\,1$

$\,x + (\,1 - \,8\,x + \,9\,y) =$ ?

$\,7\,x +\,9\,y \,-1$ $\,9\,x \,-9\,y \,-1$ $\,-7\,x +\,9\,y +\,1$ $\,-7\,x \,-9\,y +\,1$ $\,9\,x +\,9\,y +\,1$

$\,9 + ( - \,5\,x + \,3) - ( \,6 - \,3\,x) =$ ?

$\,-8\,x +\,6$ $\,-2\,x +\,6$ $\,-5\,x +\,9$ $\,-2\,x +\,18$

$ \,8\,x + \,7\,y - ( \,4\,x - \,5\,y)=$ ?

$\,4\,x +\,2\,y$ $\,4\,x +\,12\,y$ $\,4\,x \,-2\,y$ $\,12\,x +\,2\,y$ $\,12\,x +\,12\,y$

$ \,5\,\,x^2 - ( \,8 + \,3\,\,x^2 + \,2\,x)=$ ?

$\,8\,\,x^2 +\,2\,x +\,8$ $\,2\,\,x^2 +\,2\,x \,-8$ $\,2\,\,x^2 +\,2\,x +\,8$ $\,2\,\,x^2 \,-2\,x \,-8$ $\,8\,\,x^2 \,-2\,x \,-8$