Question 1113651
{{{sqrt (7x) -sqrt (3x) =4}}}
{{{sqrt (7x) = sqrt (3x) + 4}}}
{{{7x = 3x + 8sqrt(3x) + 16}}}
{{{4x - 16 = 8sqrt(3x)}}}
{{{x - 4 = 2sqrt(3x)}}}
{{{x^2 - 8x + 16 = 12x}}}
{{{x^2 - 20x + 16 = 0}}}
etc