Question 351995
{{{sqrt(28) + 4*sqrt(63)- 2*sqrt(7)=sqrt(4*7) + 4*sqrt(9*7)- 2*sqrt(7)}}}
{{{sqrt(28) + 4*sqrt(63)- 2*sqrt(7)=sqrt(4)*sqrt(7) + 4*sqrt(9)*sqrt(7)- 2*sqrt(7)}}}
{{{sqrt(28) + 4*sqrt(63)- 2*sqrt(7)=2*sqrt(7) + 4*3*sqrt(7)- 2*sqrt(7)}}}
{{{sqrt(28) + 4*sqrt(63)- 2*sqrt(7)=2*sqrt(7) + 12*sqrt(7)- 2*sqrt(7)}}}
{{{sqrt(28) + 4*sqrt(63)- 2*sqrt(7)=sqrt(7)(2+12-2)}}}
{{{highlight(sqrt(28) + 4*sqrt(63)- 2*sqrt(7)=12sqrt(7))}}}