exam Maths Puzzle Numerical Ability

9x - 1 = -28

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I've been trying to solve an equation that carries 3 variables with three lines.

2/3x-1/6y+1/2z=11/2
5/6x+3/4y-1/12z+1/4=0
1/4x+5/6y=9/4-2/3z


I've turned this int
THIS ONE HAS ME REALLY CONFUSED. I KNOW THE ANSWER IS SIMPLE AND I AM JUST MAKING MORE OF IT, BUT IT HAS BE WHIPPED. I HAVE TO SHOW ALL WORK TO SOLVE FOR x.

6 - x + 12 = 10x + 7