exam Maths Puzzle Numerical Ability

Simplify:

M to 4power(N-3power)/M-2 power)-3power N 0 power (M-4 power N8power)2 power/(N8 power M-2 power)2power

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exam Other Question

(3x+1)* (2x-x^2)* 3 divided by (3x+1)^2 What does it mean when you have a sum, say for instance: y=2x+10 and it asks you what the value of x is?
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