book Maths Puzzle Numerical Ability

what is 7+7x7-7divided by 7?(thank you for your help)

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book Other Question

5x+4=-11 I've been trying to figure out how to get an answer for these two equations, plus their explanations if possible.

1. A if/then (B if/then C)
2. A and X
3. B and (Y and Z)