Book Maths Puzzle Algebra

Solve
2x+ y+ 3z=1
2x+6y+ 8z=3
6x+8y+18z=5

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Book Other Question

The length of a rectangle is 8ft greater than it's width. If the width were doubled, the area of the rectangle would be 84 sq. ft. greater than it is now. Find the dimensions of th Solve
x- 3y+ 2z=18
5x-13y+12z=80