Question 121572
{{{3sqrt(2z)=9}}}
{{{sqrt(2z)=3}}} Divide both sides by 3.
{{{2z=9}}} Square both sides. 
{{{z=9/2}}} Divide both sides by 2.
{{{sqrt(2x-1)=x-7}}}
{{{2x-1=49}}} Square both sides. 
{{{2x=50}}} Add 1 to both sides.
{{{x=25}}} Divide both sides by 2.