book Maths Puzzle Numerical Ability

how do you do variables .
Ex.

x=4, y=12

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book Other Question

How do you find the average of a set of numbers? Factor each expression completely:
-21 a x3y3 - 28x3y4 + 7x2y3z

xy + 3y -6x -18

6a2 + 4bx - 15a-10b

16a2 + 8a - 15