Question

If 3x / 4 = 7 - x / 3, then x = what?

Answer 1

$\frac{3x}{4} = 7-\frac{x}{3}$
$\frac{3x*3}{4*3} = \frac{7*12}{12} -\frac{x*4}{3*4}$
$\frac{9x}{12} = \frac{84}{12} -\frac{4x}{12}$
$12*( \frac{9x}{12} = \frac{84}{12} -\frac{4x}{12} )$
$9x=84-4x$
$13x=84$
$84/13$