book Maths Puzzle Numerical Ability

Yikes nobody I know knows this stuff. Please Help
Thanks bunches.

2/3y + 4 = 2x

secondly


1/2(y + 5) + 4x = 3x

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book Other Question

Use the Gauss Jordan method to solve the system of equations:
x+y+2z=7
3x-y+z=10
2x+y-3z=-6
3x + 2y =16
2x + y =9