$$\underline{7,}; z+3\ge zz+3$$
$z=z_{2}$
$$z=z_{2}+3-3$$
$$z=z_{2}$$
Show Solution
Hide Solution
$z_{2}=z$
$$z_{2}+3=z+3$$
$$z_{2}=z+3-3$$
$$z_{2}=z$$
