exam Maths Puzzle Numerical Ability

w+3x-y+2z =-4
w-2x+3y+5z=-3
3w+2x+y+z=9
2w-x+2y+z=7

I need to know what w,x,y,and z
Please help me Im so lost.

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m to the eighth power n to the sixth power over m to the fourth power n to the second power. A camcorder that regularly sells for $900 is on sale for $750. Find the discount rate.