book Maths Puzzle Numerical Ability

simplify expression 8a+7-11a

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Hi could you help me with this problem please, thank you so much! Here is the expression: 12(1/4x + 1/3) - 1/2(12x - 6). Thank you so much!! If x/y=4/7 and y/z=14/3.What is the value of [x+y]/z? could you solve this?