Exam Maths Puzzle Algebra

what is 8x+3y=3

4x+5y=-23

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Exam Other Question

Solve for x in the lowest possible terms. 5x^2-2=3x
Please solve for X, Y, and Z in the 3 variable equation.

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