book Maths Puzzle Numerical Ability

How do you solve 2[y-4(y=3)]-6(y-1) When y=5

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-9x+15=-22-4(x+12)
-9x+15=-22-4x+48
-9x+15=4x+26
15=5x+26
-11=5x
-2.2=x
im trying to solve for varibles in a matrice:

[3x 4y] = [27 -16]
-48 49 -3w 7z