exam Maths Puzzle Numerical Ability

How do you explain how to do this problem and solve, thanks.
4 In x + 7 In y - 3 In z

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exam Other Question

pls solve

(2a^-3a+5)-(-3a^+8a-4)
simplify the following expression
(b^2+5b+6/3bc) / (b^2-9/6bc)

A) b+2/2(b-3)
B)b+2/b-3
C)2(b+2)/b-3
D)-1