I think you mean solve for y, since there is not an x... But either way, if I am correct:
3(6+y) = 4y-(16+y) Multiply
18+3y = 4y-16-y Subtract like terms
18+3y = 3y-16 Subtract 3y from both sides
18=16 This set does not have a solution.
I hope this helps...Sorry if I have misguided you. Have a great day!