exam Maths Puzzle Numerical Ability

2a-{6b-4[a-(b-3a)]}
Please help with this problem, also what type of problem would this be called?
Thanks in advance.
Bob

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exam Other Question
how do i solve 2x-6y= -12 Can someone help me on this?

I need to add: Write the answer in the lowest term"
5/9 + 8/9 is it:
(A) 13/18
(B) 1 1/3
(C) 1 4/9
(D) 1 2/3

Thanks,
Lyn