exam Maths Puzzle Numerical Ability

What is the meaning of one star in algebra.

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exam Other Question

solve using cramers rule:

2x-3y-3z=25
3x+1y-1z=-5
5x-2y-4z=32


I am very confused with this problem...please help!
solve by substitution method:

x=y+3
3x-2y=4