book Maths Puzzle Numerical Ability

a weight lifter puts an x-pound weight on each sdie of a bar. A weight 5 pounds heavier than the first is then added to both sides. Finally, a weight 5 pounds heavier than the seco

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How do I solve

x +3y -6z =7
2x -y +z =1
x +2y + 2z =1

Thanks,
Tijuana Fill in the blank to make a true statement.
The inequality c <x< l is equivalent to _______________.

c> x and x> l

c> x and x< l

c< x and x< l

c< x