Question 845567
Use sqrt(7), it's less confusing especially when you need to divide.
{{{5sqrt(7)+sqrt(7)-2sqrt(7)=sqrt(7)*(5+1-2)}}}
{{{5sqrt(7)+sqrt(7)-2sqrt(7)=sqrt(7)*(4)}}}
{{{5sqrt(7)+sqrt(7)-2sqrt(7)=4sqrt(7)}}}