$\,9 + ( - \,8\,x + \,8) - ( \,1 - \,7\,x) =$ ?

$\,6\,x +\,9$ $\,-15\,x +\,16$ $\,-\,x +\,18$ $\,-\,x +\,16$

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

$\,6\,\,x^2 +\,11\,x$ $\,10\,\,x^2 \,-3\,x$ $\,6\,\,x^2 \,-3\,x$ $\,-10\,\,x^2 +\,11\,x$ $\,-10\,\,x^2 \,-3\,x$

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

$\,-8\,\,x^2 +\,9\,x +\,7$ $\,8\,\,x^2 +\,9\,x +\,7$ $\,8\,\,x^2 \,-5\,x +\,7$ $\,8\,\,x^2 +\,9\,x \,-7$ $\,-8\,\,x^2 +\,9\,x \,-7$

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

$\,-4\,x +\,2\,y$ $\,-4\,x \,-2\,y$ $\,8\,x +\,2\,y$ $\,8\,x +\,10\,y$ $\,-4\,x +\,10\,y$

$\,x + (\,3 - \,4\,x + \,7\,y) =$ ?

$\,5\,x \,-7\,y \,-3$ $\,-3\,x \,-7\,y +\,3$ $\,3\,x +\,7\,y \,-3$ $\,5\,x +\,7\,y +\,3$ $\,-3\,x +\,7\,y +\,3$

$ \,6\,\,x^2 - ( \,9 + \,4\,\,x^2 + \,5\,x)=$ ?

$\,2\,\,x^2 +\,5\,x +\,9$ $\,2\,\,x^2 +\,5\,x \,-9$ $\,10\,\,x^2 +\,5\,x +\,9$ $\,10\,\,x^2 \,-5\,x \,-9$ $\,2\,\,x^2 \,-5\,x \,-9$