book Maths Puzzle Numerical Ability

Yikes nobody I know knows this stuff. Please Help
Thanks bunches.

2/3y + 4 = 2x

secondly


1/2(y + 5) + 4x = 3x

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book Other Question

Simplify: -12^-2 Why do you divide the sequence in the 2nd difference of a quadratic equation before adding it to your formula?