exam Maths Puzzle Numerical Ability

Can you help me with this? It is so confusing on how to get the answer. Thank you.

x^2 - 3x = -6 - 1

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exam Other Question

the problem is: 2y^2=14y. I need to solve this by factoring. The first thing I think I would do is factor out the greatest common factor which would be 2. I get to the point of 2(y^2-7y) but I am stuck on what y equals.
thanks,
Michael 21a^3b^2c^4, 28a^2b^3c^6, 32ab^4c^5 I need help with this problem