exam Maths Puzzle Numerical Ability

solve each system:

2x- y+3z=-14
3x-2y+4z=11
5x+ y-6z=-32


i am very confused on how to solve this...please help!

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exam Other Question

There are 7 girls in the bus, each girl has 7 backpacks, each backpack has 7 big cats, for each big cat there are 7 little cats.

How many legs are on the bus?
What percent of 160 is 56?

Help again please.