exam Maths Puzzle Numerical Ability

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

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exam Other Question

9x - 1 = -28 solve by graphing; estimate the coordinates of the intersection point to the nearest half unit.
x+y=-2; 2x-y=10