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

$\,-2\,x \,-9\,y +\,9$ $\,-2\,x +\,9\,y +\,9$ $\,8\,x \,-9\,y \,-9$ $\,8\,x +\,9\,y +\,9$ $\,2\,x +\,9\,y \,-9$

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

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

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

$\,-6\,x \,-12$ $\,-6\,x +\,18$ $\,-8\,x +\,4$ $\,-5\,x +\,3$ $\,-6\,x +\,4$

$ \,8\,\,x^2 - ( \,6 + \,5\,\,x^2 + \,6\,x)=$ ?

$\,3\,\,x^2 +\,6\,x +\,6$ $\,3\,\,x^2 \,-6\,x \,-6$ $\,13\,\,x^2 +\,6\,x +\,6$ $\,13\,\,x^2 \,-6\,x \,-6$ $\,3\,\,x^2 +\,6\,x \,-6$

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

$\,-13\,\,x^2 \,-3\,x$ $\,13\,\,x^2 \,-3\,x$ $\,3\,\,x^2 \,-3\,x$ $\,-13\,\,x^2 +\,13\,x$ $\,3\,\,x^2 +\,13\,x$

$ \,2\,x + \,3\,y - ( \,7\,x - \,9\,y)=$ ?

$\,9\,x +\,12\,y$ $\,9\,x \,-6\,y$ $\,-5\,x \,-6\,y$ $\,-5\,x +\,6\,y$ $\,-5\,x +\,12\,y$