exam Maths Puzzle Numerical Ability

order of operations.

(7-1+6)

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I need help please I am not sure but I believe the answer -6/0 which I believe is undefined. Am I right? Thanks so much for your help.
Perform the indicated operation.


14-20
_________

(4)(3)-12
I need to solve this equation on a worksheet:

log X +log (X + 2) = log 3

Thank you!!!