How to solve 2^ (4x-1) - 4x+1/2+2=0?

(a) 2X1 + X2 - X3 = 8

-3X1 - X2 + 2X3 = - 11

-2X1 + X2 + 2X3 = - 3

(b) 3X1 - X2 + 5X3 = - 2

2X1 + 4X2 - X3 = 3

-4X1 + X2 + 7X3 = 10

(2) Using elementary row operations investigate the consistency of the following systems.

(a) 2X1 + 4X2 - 2X3 = 0

3X1 + 5X2 = 1

(b) X1 - X2 + 2X3 = 4

X1 + X3 = 6

2X1 - 3X2 + 5X3 = 4

3X1 + 2X2 - X3 = 1

(3) consider the system

X1 + 2X2 + 3X3 = a

2X1 + 5X2 + (a+5) X3 = - 2+2a

- X2 + (a^2 - a) X3 = a^2 - a