Question 99472
{{{sqrt(63)-2sqrt(28)+5sqrt(7)}}}
{{{sqrt(9*7)-2sqrt(4*7)+5sqrt(7)}}}
{{{3sqrt(7)-2*2sqrt(7)+5sqrt(7)}}}
{{{3sqrt(7)-4sqrt(7)+5sqrt(7)}}}
like terms are now collected so you can add and subtract as needed:
{{{4sqrt(7)}}}
:)