Exam Maths Puzzle Algebra

Please solve for X, Y, and Z in the 3 variable equation.

x + 2y + z = 6
x + y = 4
3x + y + z = 8

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what is 8x+3y=3

4x+5y=-23 A man sold two-thirds of his pencils for 20 cents each. If he has 7 pencils left, how much money did he collect for the pencils he sold?