exam Maths Puzzle Numerical Ability

I cannot figure this out step by step.

-2=X+14

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exam Other Question

(3x+2y)^2

Is ^2 multiplied by the coefficients and variables? which of the following represents a permutation?
a. rolling a number cube
b. arranging a wardrobe options of jeans and sweaters
c. choosing 1st,2nd, and 3rd chair in the band
d. selecting 6 CDs from a collection of 50