exam Maths Puzzle Numerical Ability

The problem states:

Divide and simply:
(x^2 - 16)/(x^2 + 4x + 4) ÷ (x^2 + 3x - 4)/(x^2 - x - 2)


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in a + bi
sq rt ^3 4x-1+2=0

and

1/2-1/3 (4-x) = x/6
A line passing through (4, 20) and (6, y) is parallel to a line with slope -7. What is the value of y?