book Maths Puzzle Numerical Ability

6t=3(t+4)-t

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book Other Question

-3[9(x-4)+5x]-8{3[5(3y+4)]-12} I just want to make sure I got this right. This is a homework test problem not from a book. I need to simplify this equation. I hope this comes out right on the screen.
(4x^3^ay^b