Here is what I think
(3/11)x= -15. Then you divide both side of the equation by 3/11.
x= -15/(3/11) On the left side you have x, and on the right side, you'll have -15/(3/11).
x= -15 *11/3 Since dividing by a fraction, you have to multiply by the reciprocal.
x= -55 Divide -15/3 = -5, then multiply with 11, you have -55.