I keep getting moles in the negatives...but I don't know where my mistake is:

55.85x + 26.98y = 3.753

55.85(0.1456 - 2/3y) + 26.98y = 3.753

8.132 - 37.233y + 26.98y = 3.753

-10.253y = -4.379

y = 0.4271

x + 2/3y = 0.1456

x + 2/3(0.4271) = 0.1456

x + 0.2847 = 0.1456

x = -0.1391 ... theres the mistake...